The number of $$\theta \in [0, 4\pi]$$ for which the system of linear equations
$$3(\sin 3\theta) x - y + z = 2$$
$$3(\cos 2\theta) x + 4y + 3z = 3$$
$$6x + 7y + 7z = 9$$
has no solution is

A

$$6$$

B

$$7$$

C

$$8$$

D

$$9$$