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]: Dicots have ____ seeds leaves, whereas monocots have only one.\Question: Choose the right answer from options given a) four b) one c) seven d) two
[EX A]: d

[EX Q]: Female cats come into heat cycles every ____ to four weeks during certain times of the year.\Question: Choose the right answer from options given a) eight b) ten c) zero d) three
[EX A]: d

[EX Q]: Giant pandas are perhaps the most unusual of the world's ____ species of bears.\Question: Choose the right answer from options given a) eight b) six c) seven d) ten
[EX A]:
a