Correct option is D
“MARS” is coded as "51" and 'STARS" is coded as "77" in this following logic is followed –
MARS place value of the alphabet → 13 + 1 + 18 + 19 = 51
STARS→ 19 + 20 + 1 + 18 + 19 = 77
Similarly,
MOON → 13 + 15 + 15 + 14 = 57
Thus, the correct option is (d).