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: Most marine sediments are of ____ basic types.\Question: Choose the right answer from options given a) three b) ten c) two d) nine

Answer: c


Question: Carbon can bond to a maximum of ____ atoms.\Question: Choose the right answer from options given a) six b) ten c) five d) four

Answer: d


Question: Whales are thought to sleep around ____ hours a day .\Question: Choose the right answer from options given a) three b) seven c) no d) eight

Answer:
d