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]: Ultrasonic liposuction fits into ____ categories.\Question: Choose the right answer from options given a) two b) seven c) nine d) one
[EX A]: a

[EX Q]: Most viruses have only ____ organelles.\Question: Choose the right answer from options given a) ten b) two c) four d) eight
[EX A]: b

[EX Q]: Tadpoles take three to ____ months to complete their development.\Question: Choose the right answer from options given a) seven b) eight c) zero d) four
[EX A]:
d