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: Parliaments can last five years, often last ____ and a bit.\Question: Choose the right answer from options given a) four b) three c) five d) two

Answer: a


Question: Electrons have almost ____ mass and are negatively charged.\Question: Choose the right answer from options given a) three b) seven c) zero d) no

Answer: d


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

Answer:
c