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').

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

A: b
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Q: Toenails are similar , except that they grow ____ times slower and are on the toes .\Question: Choose the right answer from options given a) two b) eight c) six d) four

A: d
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Q: Freshwater stingrays can have up to ____ venomous spines in their tails.\Question: Choose the right answer from options given a) seven b) three c) one d) two

A:
b
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