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: Natural indium contains ____ isotopes.\Question: Choose the right answer from options given a) one b) eight c) two d) seven

Answer: c


Question: Insects are arthropods that have a body with three segments, ____ legs, and one set of antennae.\Question: Choose the right answer from options given a) three b) one c) six d) zero

Answer: c


Question: Bugs have four wings or ____ wings at all.\Question: Choose the right answer from options given a) five b) no c) six d) seven

Answer:
b