Correct option is C
CHAIR → 61621836
C = 3 → 3 × 2 = 6
H = 8 → 8 × 2 = 16
A = 1 → 1 × 2 = 2
I = 9 → 9 × 2 = 18
R = 18 → 18 × 2 = 36
So, CHAIR becomes 61621836
TABLE → 40242410
T = 20 → 20 × 2 = 40
A = 1 → 1 × 2 = 2
B = 2 → 2 × 2 = 4
L = 12 → 12 × 2 = 24
E = 5 → 5 × 2 = 10
So, TABLE becomes 40242410
STOOL → 3840303024
S = 19 → 19 × 2 = 38
T = 20 → 20 × 2 = 40
O = 15 → 15 × 2 = 30
O = 15 → 15 × 2 = 30
L = 12 → 12 × 2 = 24
So, STOOL becomes 3840303024.
Now, for SOFASET, we apply the same rule:
S = 19 → 19 × 2 = 38
O = 15 → 15 × 2 = 30
F = 6 → 6 × 2 = 12
A = 1 → 1 × 2 = 2
S = 19 → 19 × 2 = 38
E = 5 → 5 × 2 = 10
T = 20 → 20 × 2 = 40