Help!~ it's math... A bowl contains candies of the same size in three flavors: orange, strawberry, and pineapple. If the probability of randomly pulling out an orange candy is 1 over 7 , and the probability of randomly pulling out a strawberry candy is 2 over 7 , what is the probability of randomly pulling out a pineapple candy? (1 point)

A. 3 over 7
B. 4 over 7
C. 5 over 7
D. 6 over 7

I'm not sure if it's 3 over 7 or 4 over 7.
Can someone tell me which one it is? A. or B.?