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: Northwestern's Caesar system is the foundation of their student interface. That's because 
Completion A: it handles loans, registration, and other essential services. 
Completion B: Caesar is a robot that heckles students if they don't complete school requirements. 
Completion C: Caesar controls their grades. 
Completion D: Caesar was an Ancient Roman emperor who ruled at the apex of the empire.
Completion A

Prompt: I like my father but my mother hates him ever since their Divorce. She loves my step-father though. My father is my mother's 
Completion A: husband 
Completion B: Ex-husband 
Completion C: father 
Completion D: Friend
Completion B

Prompt: A women is holding a baby in the park. An old lady 
Completion A: wants to take the baby away. 
Completion B: talks to her son to have a baby right now. 
Completion C: is bathing the sun in the park. 
Completion D: smiles at them.

Completion D