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]: Snowflakes are crystals that have many different shapes, but each snowflake has ____ points on it.\Question: Choose the right answer from options given a) six b) nine c) one d) seven
[EX A]: a

[EX Q]: Chlorine is manufactured in ____ ways.\Question: Choose the right answer from options given a) four b) two c) nine d) seven
[EX A]: b

[EX Q]: Human shelters make ____ provisions for pets, as a result they are often left behind.\Question: Choose the right answer from options given a) one b) nine c) no d) eight
[EX A]:
c