Question

Which are the "s" and "t" prepositions

A. sound, took, take, till
B. since, through, throughout, till
C. thorough, that, test
D. since, sass, tag, tail

Answer 1

We can exclude all the options that have verbs in them (at least one verb)
A "took"

and which have nouns:

C. "test"
D. "tail"

so we are left with the option B. and yes - all the words in this options are prepositions, so it's the correct answer!