If \(X=373^p\cdot 426^q,\) where \(p\) and \(q\) are positive integers, what is the units digit of \(X?\)

[VJesus12]

If \(X=373^p\cdot 426^q,\) where \(p\) and \(q\) are positive integers, what is the units digit of \(X?\)

(1) \(p^2+2pq+q^2=36\)
(2) \(p = 2\)

Answer: B

Source: e-GMAT