Answer:
B. lacking parallelism
Explanation:
The original sentence contains a predicate nominative (<em>singer</em>) and an action verb (<em>plays</em>), which shows lack of parallelism.
The best way to fix the error would be to use a parallel structure, which is the repetition of a certain grammatical form within a sentence:
"Shelia E. <em>sings </em>and<em> plays</em> the drums."
Now the sentence uses two action verbs <em>sings </em>and<em> plays</em> in the present tense, and this is an example of parallelism.
All the people planned to go to the library.
