Select the correct answer. How is the noun in bold letters used?

Unfortunately, my raises do not keep up with the increases in the cost of living.

A.
Subject
B.
Direct object
C.
Indirect object
D.
Predicate nominative

may I know the noun in bold?

Explanation:

you did not underline anything

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.

what are the phrases to choose from?