Answer:
B. A pronoun that could refer to more than one person,place or thing.
Explanation:
When a sentence does not clearly identify which noun a subsequent pronoun refers to, the error is referred to as an unclear antecedent.
His last play that he wrote alone. believed to be written 1610-1611 considered on of his greatest works
I would say noun clause, but seeing as that is not an option, appositive?