What is more efficient among two persons A and B?
I. A and B to getber can complete a job in 10 days.
II. A alone can complete the job in 15 days.

A

if the statements I alone is sufficient to answer the question.

B

if the statements II alone is sufficient to answer the question.

C

if the statements I and II together are sufficient to answer the question but neither statement alone is sufficient.

D

if both the statements I and II together are not sufficient to an answer the question and additional data is required.