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: Circles mark the approximate locations of ____ recently discovered solar systems.\Question: Choose the right answer from options given a) four b) no c) zero d) nine

Answer: a


Question: Poisons come in ____ different forms .\Question: Choose the right answer from options given a) four b) no c) five d) ten

Answer: a


Question: Worms can live as long as ____ years.\Question: Choose the right answer from options given a) six b) four c) eight d) seven

Answer:
b