c)

 2 1  3

To find the product of the matrix and the vector, we can perform the matrix multiplication.

The given matrix is:

[2 1]

And the given vector is:

[3]

To perform the matrix multiplication, we need to multiply each element of the matrix by the corresponding element of the vector and sum the results.

So,

2 * 3 + 1 * 0 = 6 + 0 = 6

Therefore, the product of the matrix and the vector is 6.