Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').

Ex Input:
Plants have at least ____ sHSP gene families which comprise a large multigene family.\Question: Choose the right answer from options given a) zero b) eight c) five d) seven

Ex Output:
c


Ex Input:
Sound waves travel through the air in a similar manner, but in all ____ dimensions.\Question: Choose the right answer from options given a) three b) five c) nine d) one

Ex Output:
a


Ex Input:
Corals can reproduce asexually by at least ____ described strategies.\Question: Choose the right answer from options given a) four b) seven c) ten d) five

Ex Output:

d