In the matrix $$A = \begin{bmatrix}-5 & 20 \\2 & x \end{bmatrix}$$, what is the value of the x?

I. A is singular.

II. A is symmetric.

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 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.