Which of these sentences is correctly written?

a. the audience howled with laughter at the outrageous antics of the actors.

b. the team was forced to forfit the game after several players were injured.

c. the students have accumalated many community service credits this year.

d. the driving student became frustrated with her instructor's interferance
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Read the excerpt from “strychnine in the soup,” in which mr. mulliner explains the ending of a mystery novel to a bar patron who is anxious to know the conclusion of the story. “the plumber forgot his snake and had to go back for it,” explained mr. mulliner. ‘‘i trust that this revelation will prove sedative.” “i feel a new man,” said the draught stout. “i’d have lain awake worrying about that murder all night.” explain how a student who did not know the meaning of sedative could infer its definition?