___ is a way of showing that one thought in a sentence is not as important as another. Select one:
a. Conjunction
b. Subordination
c. Preposition
d. Exposition

Subordination

Explanation:

A conjunction is a part of speech which helps in connecting words, clauses or phrases together e.g. and, if, but.

A preposition is a word that is used before a noun, or pronoun to show direction, location, time, or place, Examples are at, in, on, of.

An exposition refers to the comprehensive description of an idea. It is a detailed description of an event.

Subordination uses conjunctions to connect a dependent clause to the independent clause which brings about a complex sentence. It shows that one idea isore important than the other.

d is the best answer for this question.

hm, switch the relative; nominative and indefinite; objective ? not too bright in the knowledge of the english.