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: Tetrapods are animals that have ____ legs or leg-like appendages.\Question: Choose the right answer from options given a) four b) one c) ten d) six

Answer: a


Question: Every person is a carrier for about ____ rare genetic conditions.\Question: Choose the right answer from options given a) nine b) ten c) six d) three

Answer: b


Question: Direct sunlight influences postharvest temperature responses and ripening of ____ avocado cultivars.\Question: Choose the right answer from options given a) five b) two c) seven d) nine

Answer:
a