The correct domain restriction is x=0, so option C is the correct answer.
To find domain restrictions on the given rational equation, we need to identify any values of x that would make the denominators equal to zero, as division by zero is undefined.
The given equation is:

The denominators in the fractions are 3x², 2, and x. We need to check when each of these denominators would be equal to zero.
For 3x², the denominator will be zero when x=0 (because 0²=0).
For 2, the denominator is a constant and will never be zero.
For x, the denominator will be zero when x=0.
So, the values of x for which the denominators become zero are x=0.
Therefore, the correct domain restriction is: C. x=0