In my personal experience, I've found that writing out notations helps me find the right answer particularly for questions that require chaining multiple conditional statements (like this example). For some other MBT questions, it's easier to just categorize everything in my head as opposed to writing everything out.

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@holmesvc1 said:

How do you feel about strengthening questions? I tend to look for the answers that strengthen the argument and eliminate those. Usually 3/5 choices strengthen the argument in some way. 1/5 are completely unrelated to the argument and then the last one is your correct answer choice.

Seconding this. Find the conclusion in the stimulus, take a look at the answer choices, and ask yourself which of the answer choices make the argument MORE bulletproof. In the process of looking for what strengthens the argument, you'll come across an AC that weakens the argument instead (what you're looking for!) Same methodology can be used for Strengthening questions by looking for the weakening ACs instead - look for the opposite.

Incorrectly chose C - direct result of assuming the second half of the opening sentence (post because) was the greater conclusion as opposed to a premise building off the latter.