The following sentence has an error. Indicate what type of error. We will go to the seminars because we have always found its training sessions to be useful.
verb tense
noun-pronoun agreement (number or case)
subject-verb agreement
vague pronoun reference

Which of the following is the best example of substitution? a. movie producers begin making more comedies because they cost less to make than action films. b. people walk out before the end of a movie because the acting and the plot are terrible. c. people at the movie theater switch from popcorn to candy because popcorn has gotten too expensive. d. more people begin going to matinee movies instead of night movies to save money on the tickets.