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: Some motors contain ____ gears and spin very fast, and have little if any torque.\Question: Choose the right answer from options given a) four b) three c) five d) no

A: d
****
Q: Many soils have ____ major layers or horizons, top soil, subsoil and parent material.\Question: Choose the right answer from options given a) one b) two c) seven d) three

A: d
****
Q: Snowshoe hare can have up to four litters a year, with ____ to nine young per litter.\Question: Choose the right answer from options given a) two b) one c) six d) no

A:
b
****