If a, b, c, d are in Arithematic Progression what is the value of d - b?
I) a + b + c = 40
II) The common difference of that A.P is 4

A

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

B

if the statement 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 answer the question and additional data is required.