OE

“In his enthusiasm” functions as a straight-ahead road sign here; Professor Assem's teaching must be informed by his passion for introducing students to his subject matter. If a lecture is “steeped” in theoretical material from an “advanced discipline,” you would expect it to be challenging to understand or possibly boring. Therefore, the professor must want to make his lectures understandable to students or entertaining to students. Either prediction is a possibility, so keep them both in mind. Accessible, (A), means “obtainable” or “easy to understand,” which matches the prediction. The professor may also hope his lectures are (B) enjoyable. Comprehensible, (C), gives the sentence the same meaning as does accessible, so even though (B) would fit in the sentence, the correct choices are (A) and (C). The material itself may be daunting, or “intimidating,” and bemusing, (E), which means “bewildering” or “confusing,” but these words do not describe the lectures Assem hopes to deliver. Salient, (F), means “prominent” or “important.” While the professor likely wants to deliver salient lectures, no other choice has a similar meaning.