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 Q]: Females can only have four babies at ____ time.\Question: Choose the right answer from options given a) no b) one c) nine d) three
[EX A]: b

[EX Q]: Selenium is ____ times more poisonous than arsenic.\Question: Choose the right answer from options given a) one b) five c) eight d) two
[EX A]: b

[EX Q]: Insects have six jointed legs and ____ body parts.\Question: Choose the right answer from options given a) three b) five c) ten d) no
[EX A]:
a