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 birds have ____ toes, three that face forward and one rearward.\Question: Choose the right answer from options given a) two b) ten c) nine d) four

Answer: d


Question: Tilt consists of ____ small surface vents.\Question: Choose the right answer from options given a) zero b) three c) seven d) no

Answer: b


Question: Some tropical bats can have ____ pregnancies a year.\Question: Choose the right answer from options given a) seven b) nine c) two d) eight

Answer:
c