The possessive form of the noun teacher indicates its relationship to
a. a verb.
b. an adjective.
c. an adverb or an adjective.
d. another noun.

B. an adjective.

Explanation:

The possessive form of the noun teacher is teacher's. This is called the genitive case. This case is used to modify nouns and it is used to indicate possession. For example: The teacher's lessons are interesting. The possessive form of teacher or the genitive case is indicating we are referring to his / her lessons as opposed  to, for example, the Head's lessons. The School Head might also teach and we can compare both lessons: the teacher's lessons and the head's lessons.

there are number of topics. you can pick any one of these topics:

for the comment!