Given the task definition and input, reply with output. Given a prompt and four completions, select the completion that is the most plausible in continuing or answering the prompt. This task is designed to test common sense and has various categories ranging between idioms, negated statements, polysemy, subject referencing, and quantitative reasoning. Generate either Completion A, Completion B, Completion C, or Completion D.

Prompt: Tina wants to improve her Math grades. Tina 
Completion A: spends a lot of time playing games. 
Completion B: never attends class. 
Completion C: works hard. 
Completion D: likes shopping.

Completion C