A summer day is "pleasant" if there are intermittent periods of wind and the temperature stays below 84°F (29°C) all afternoon. █ ██████ ███ ████ ████ ████████ ██████ ██ ████████████ ██████ ██ ███ ███████████ █████ █████ █████ ███████ ███ █████████ ██ ██ █████ ██ ██ █████
We’re given two conditionals that describe summer days:
(1) If it has periods of wind and stays below 84 degrees, then a summer day is pleasant.
(2) If it’s humid and stays above 84 degrees, or if it’s humid and has no wind, then a summer day is oppressive. 
We need to find the answer choice that correctly follows these rules. We’re looking for a summer day that fulfills the sufficient conditions of either rule, and that is then correctly labelled as either pleasant or oppressive.
Which one of the following ██████ ███████ ███████ ████ ███████ ████████ ██ ███ ██████████ ██████ ██████
The temperature on ██████ ██████ █████ █████ ███████ ███ ████ ███ █████ ███ ██ ████ ██ ████ ██ ███ █ ███ ██ ███ █████████ ███ ██ ███ █ ████████ ████
To conclude that a day was pleasant, we have to know it had wind and was below 84 degrees. (A) gives us a day below 84 degrees, but one without wind, so we can’t conclude it was pleasant.
On Monday, the ███████████ ██████ ████ █████ ██ █████ ██████ ██ ██████ ████ █████ ███████ █████ ██████ ██ ███ ██ ██████████ ███ ████ ██████ ███ ████████ ██████ ████ ████
Regardless of how hot it is, we have to know that a day is humid to conclude that it is oppressive. (B) specifically tells us the day is not humid, so we can’t conclude it was oppressive.
On Tuesday, the ███████████ ███████ ████ █████ ███ ████ █████ █████ ███████ ██████████ ████ ███████ ███ ███ ██████████ ██ ███ █ ████████ ███ ███████ █████ ████ ██████████ ███████ ██ █████
To conclude that a day is pleasant, it must have wind and be below 84 degrees. (B) gives us a day with wind, but tells us that it was exactly 84 degrees, so the temperature was never below 84. As such, we don’t know if it was pleasant.
On Wednesday, a ██████████ ██████ ██ ███ █████ ███████ ██████ ████████████ ██ ████ ████████ ███ ███ █████ ████████ ██████ ████ ██████████ █████ ██ ███ ██ ██████████ ████ ████ ██████ ███ ███████████ ███ ███ ████ █████ █████ ███████ ███ ████
To conclude that a day is oppressive, it must be humid and either above 84 degrees or have no wind. (D) gives us a day that was humid, but it was windy and not above 84 degrees, so we can’t conclude it was oppressive.
On Thursday morning, ███ ███ ███ ████ ██████ ███ ██ ████████ ████████ ███ ███ █████ ████ ████████ ██████ ███ ███ ███ ████ █████ ███ ████ ██████ ███ ███████████ ████ █████ █████ ███████ ███████ █████ ███ ████ ██████████ ██ ███ ██ ██████████ ████
If a day is humid and has no wind, that is sufficient for concluding it is oppressive. (E) gives us a day that was humid and had no wind, so it was oppressive.
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