Which of the following group of “signal words” would indicate a contrast? A: both, however, therefore, for that reason
B: Remember that, however, unlike, otherwise
C: Additionally, compared with, however, conclusively
D: Then again, although, however, on the other hand

I would go with B.

Explanation: The group of words for option B seem like they would be used more for contrasting than option D. It can't be option A or option C because those options use comparing signal words.

each poet admires poetry

they each admire poetry because they could just use an expression or verbally just say you but they both write in in poetry which shows they know how to write in poetry.