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:
Dicots have ____ seeds leaves, whereas monocots have only one.\Question: Choose the right answer from options given a) four b) one c) seven d) two

Ex Output:
d


Ex Input:
Nymphs feed and mature through ____ instars in about six to eight weeks.\Question: Choose the right answer from options given a) four b) eight c) five d) no

Ex Output:
c


Ex Input:
Nymphs develop through five instars over a period of ____ to six weeks.\Question: Choose the right answer from options given a) seven b) nine c) eight d) five

Ex Output:

d