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]: Teething begins for most babies around ____ to six months.\Question: Choose the right answer from options given a) three b) four c) five d) seven
[EX A]: b

[EX Q]: 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
[EX A]: a

[EX Q]: Crystalline materials demonstrate long range periodic order in ____ dimensions.\Question: Choose the right answer from options given a) ten b) three c) seven d) eight
[EX A]:
b