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').

Reverse osmosis uses ____ to ten gallons of water to produce one gallon of drinking water.\Question: Choose the right answer from options given a) two b) zero c) five d) three
d

Most families have between ____ and eight children.\Question: Choose the right answer from options given a) four b) one c) five d) three
c

Pangolins walk on all ____ of their stout limbs, which are adapted for digging.\Question: Choose the right answer from options given a) seven b) four c) five d) ten

b