What do you mean by you don't understand the stimuli? Is it the English grammer or the logical structure? Do you understand it after you watch the explanation?
From my memory, I think the correct answer is A.
As for your question regarding contrapositive, watch out for quantifiers such as some and most.
Remember what the lessons taught you: there are NO contrapositives for quantified statements.
Same I want to confidently score a little higher pre-BR but progress is really slow...
I started using a watch after I saw Dean's post. It has helped me with skipping questions. If it takes more than 1.5 min I skip it and come back to it.
... have the LSAT 180 watch. I purchased the watch a few weeks ... time myself I noticed the watch would automatically reset back to ... reset, and found that my watch will time up to 30 ...
The guy in this video claims to have gotten a perfect 180 and did so by redoing about 20 different practice tests repeatedly (there were only about that many PT's available when he was studying). http://www.youtube.com/watch?v=_sOsE0OlR00
Also- reset any analog watch to the hour at the start of each 35-minute section. You don't have to do the math in your head, and during the LSAT the actual time of day doesn't matter.