Answer:just
Explanation:because its the adverb of relation in time
Instrument is to musician
stethoscope is to doctor
easel is to artist
A is wrong because it’s not starting with an assumption but it’s starting with an opinion.
B is wrong because it’s an opinion as well
C is wrong because it’s just a quote
D is the right answer because it started out with an assumption and ended with an argument starter
hope this helped !