Choose the missing terms out of the given alternatives : N5V, K7T, ?, E14P, B19N

Answer: Option C

1st letter : N - 3 = K - 3 = H - 3 = E - 3 = B
Middle letter : 5 + 2 = 7 + 3 = 10 + 4 = 14 + 5 = 19
2nd letter : V - 2 = T - 2 = R - 2 = P - 2 = N