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: Motor neurons are divided into ____ groups.\Question: Choose the right answer from options given a) two b) six c) seven d) eight

Answer: a


Question: Today there are ____ basic classifications of sausage.\Question: Choose the right answer from options given a) five b) four c) six d) one

Answer: a


Question: Spirits are ____ dimensional creatures and therefore are see-through and can pass through walls.\Question: Choose the right answer from options given a) six b) five c) no d) four

Answer:
d