is it
a 33/87
b 43/87
c 11/76
d 76/87

Answer:
d. 76/87
Step-by-step explanation:
Out of all the flights, we're looking for the on time ones, so that's the first column. Add together the flights of both airlines:
33 + 43 = 76
Put this number over the total number of flights:
76/87 is the answer.