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').
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Question: Dunes are of ____ types - linear and parabolic.\Question: Choose the right answer from options given a) three b) four c) ten d) two

Answer: d


Question: Streptomyces are of special interest for ____ reasons.\Question: Choose the right answer from options given a) nine b) seven c) four d) two

Answer: d


Question: Scientists analyze bear hair follicles using ____ markers to determine species, sex, and individuals.\Question: Choose the right answer from options given a) seven b) one c) four d) six

Answer:
d