Which scentances uses a pronoun in the possible case A. It is a great night for a campfire
B. Be careful or your marshmallow might burn
C. I love singing silly songs under the stars
D. Is she telling a spooky story?

I believe you meant pronoun in the "possessive case."

B. Be careful or your marshmallow might burn.

Explanation:

"Pronouns" have three cases and these are: Subjective, Objective and Possessive.

Possessive case pronouns show "possession." It includes the following pronouns: my, mine, your, yours, his, her, hers, its, our, ours, their, theirs and whose.

The sentence above used the pronoun "your" in the possessive case. It shows that the second person is the owner of the marshmallow.

particulars about treasure island, from the beginning to the end, keeping nothing back but the bearings of the island, and that only because there is still treasure not yet lifted, i take up my pen in the year of grace and go back to the time when my father kept th

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