​If D = 4 and COVER = 63, then BASIS = ?​

Given: ​If D = 4 and COVER = 63

Logic: Sum of position of letters.

For, D = 4

D = 4

For, COVER = 63

C = 3, O = 15, V = 22, E = 5, R = 18

= 3 + 15 + 22 + 5 + 18

= 63

Similarly,

BASIS = ?

B = 2, A = 1, S = 19, I = 9, S = 19

= 2 + 1 + 19 + 9 + 19

= 50

Thus, correct option is (a).