The (a) amount of people (b) in the stadium (c) was really (d) quite surprising. (e) No Error

Questions 7 to 11:Error Detection:
Instruction: Underlined parts of the following sentences may contain error(s) in grammar, diction, usage or idiom; choose the underlined pan that is incorrect. If the sentence is correct as it stands, mark (e) No sentence contains more than one error.