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').

Japan is a highly urbanised country, with approximately ____ in every four people living in cities.\Question: Choose the right answer from options given a) ten b) no c) five d) three
d

Black widows mature in ____ to four months.\Question: Choose the right answer from options given a) two b) seven c) eight d) zero
a

Most individuals expect to earn three to ____ times their investment in a relatively short time.\Question: Choose the right answer from options given a) eight b) five c) zero d) four

b