TASK DEFINITION: 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').
PROBLEM: Some taxonomists classify only ____ species though.\Question: Choose the right answer from options given a) one b) six c) two d) three

SOLUTION: c

PROBLEM: Human females have ____ X chromosomes.\Question: Choose the right answer from options given a) two b) six c) one d) eight

SOLUTION: a

PROBLEM: Argentine ants are able to establish new colonies with as little as ten worker ants and ____ queen.\Question: Choose the right answer from options given a) five b) six c) ten d) one

SOLUTION:
d