If a is the average of the numbers 1. 2, 3 and x. then what is the value of a?
I. $$x = \frac{1}{2}(6a - x)$$
II. x is an integer.

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 both the statements I and II are sufficient to answer the question but neither statementaloneis not sufficient.

D

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