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').

Righteousness always points in ____ directions.\Question: Choose the right answer from options given a) six b) two c) one d) four
b

Heme is made of ____ pyrrole groups united to form a porphyrin ring.\Question: Choose the right answer from options given a) five b) four c) eight d) six
b

Royal jelly contains all ____ essential amino acids.\Question: Choose the right answer from options given a) zero b) nine c) eight d) six

c