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').

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

A: a
****
Q: China has about ____ in four of all smokers in the world.\Question: Choose the right answer from options given a) one b) seven c) ten d) six

A: a
****
Q: Cannabis seeds are planted and germinate in three to ____ days.\Question: Choose the right answer from options given a) nine b) no c) seven d) four

A:
c
****