This stimulus gives us two conditional rules.

Rule 1: If the standards committee has a quorum, then the general assembly will begin at 6:00 P.M. today.

Rule 2: If the awards committee has a quorum, then the general assembly will begin at 7:00 P.M. today.

There's a critical detail hiding in the interaction between these two rules. There's only one time that "the" general assembly can "begin" today. So if the general assembly begins at 6:00 P.M., it does not begin at 7:00 P.M. And if it begins at 7:00 P.M., it does not begin at 6:00 P.M. This lets us connect the two rules into a chain.

Starting from Rule 1: if the standards committee has a quorum, the general assembly begins at 6:00 P.M. If it begins at 6:00 P.M., then it doesn't begin at 7:00 P.M. And by the contrapositive of Rule 2, if the general assembly does not begin at 7:00 P.M., then the awards committee does not have a quorum.

Putting it all together:

standards committee has quorum → GA begins at 6 P.M. → GA does NOT begin at 7 P.M. → awards committee does NOT have quorum

The same logic works starting from Rule 2:

awards committee has quorum → GA begins at 7 P.M. → GA does NOT begin at 6 P.M. → standards committee does NOT have quorum

Want a visual?

Each committee's quorum locks the GA into a specific start time:

So if the standards committee has a quorum, the entire chain plays out like this:

Since this is a Must Be True question, we want an answer that is guaranteed by the stimulus. The correct answer will almost certainly be something that we can find on this conditional chain.