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').

[EX Q]: Human feet bear average five to ____ hundreds tons of weight everyday.\Question: Choose the right answer from options given a) six b) eight c) five d) nine
[EX A]: a

[EX Q]: Quarks also come in ____ 'colours', terms for a property a little like electrical charge.\Question: Choose the right answer from options given a) three b) nine c) six d) no
[EX A]: a

[EX Q]: Coastal kelp beds, for example, appear to be three times larger than in the past four or ____ years.\Question: Choose the right answer from options given a) five b) two c) three d) ten
[EX A]:
a