Which one of the following conditions must p, q and r satisfy so that the following system of linear simultaneous equations has at least one solution, such that p + q + r $$\neq$$ 0?

x+ 2y - 3z = p

2x + 6y - 11z = q

x - 2y + 7z = r

A

5p -2q - r = 0

B

5p + 2q + r = 0

C

5p + 2q - r = 0

D

5p - 2q + r = 0