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:
Bulbs bloom four to ____ weeks after planting.\Question: Choose the right answer from options given a) seven b) one c) six d) nine

Ex Output:
c

Ex Input:
Some litters have no runts while others have ____ or more.\Question: Choose the right answer from options given a) nine b) three c) eight d) one

Ex Output:
d