A) By studying and turning in her assignments, Erica earned an A in her English class.
Explanation:
The sentence chosen does not contain any unnecessary words or phrases, such as are repetitions or redundancies. In that respect, the information is precise and direct: Erica got a good grade because she studied and turned in her assignments.
The rest of the sentences possess redundant and avoidable words. The correct version is the following:
<em>B) He cannot play in today's game </em><em>because </em><em>his arm is broken.
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<em>
C) Our class will soon go to the Art Institute.</em>
