Pronouns in the objective case may function as

a. subjects
b. objects
c. adjectives
d, predicate nominatives

Pronouns in the objective case may function as objects (B).

The definition of objective case is the form of a noun or pronoun used as an object. The object may be a direct object, indirect object, or object of preposition. The objective case changes personal pronouns. Personal pronouns are me, you, him, her, it, us, we, and them. For example:

Pronoun: She

Objective case pronoun: Her

Sentence with objective case pronoun: I went with her.

"Her" is acting as the direct object. "She" takes the objective case and becomes her. It would not be correct to say "I went with she."

b is the answer.   i sat on the lumpy sofa, totally exhausted, with a bad taste in my mouth, wondering what i should do next.  

(4) "oh, i've got better plans than that," laughed kerry. "i've got four firecrackers and two model rockets. care to join me in the backyard? "

this is the correct answer because of one simple word. "backyard"