Is the $$\triangle$$ ABC equilateral?
I) Sum of the angles A, B is twice the third angle C
II) $$\angle A : \angle B : \angle C = 1 : 3 : 2$$

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.