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').

Most resistors have three coloured bands close together at one end and ____ single band at the other.\Question: Choose the right answer from options given a) two b) one c) ten d) five
b

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
a

Female dogs go into heat twice a year, lasting anywhere from ____ to fifteen days.\Question: Choose the right answer from options given a) zero b) seven c) eight d) three

d