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').

Example Input: Fawns weigh about ____ to nine pounds at birth.\Question: Choose the right answer from options given a) five b) ten c) nine d) six
Example Output: d

Example 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
Example Output: c

Example Input: Calcite has ____ cleavage planes.\Question: Choose the right answer from options given a) ten b) seven c) two d) nine
Example Output:
c