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').
--------
Question: Carbon forms ____ bonds.\Question: Choose the right answer from options given a) five b) four c) two d) three

Answer: b


Question: Ants have ____ noses.\Question: Choose the right answer from options given a) zero b) eight c) five d) three

Answer: c


Question: Parvoviruses fall into ____ main groups.\Question: Choose the right answer from options given a) no b) seven c) five d) one

Answer:
c