Which sentence best describes the independent and dependent variables in the following problem? the movie house charges $7 for the large popcorn and $2.50 for any additional popcorn that you order. a. the number of popcorn orders purchased depends on the total cost of the popcorn. b. the total cost of the popcorn depends on the number of popcorn orders purchased. c. the total cost of the popcorn depends on who purchased the popcorn. d. the number of popcorn orders depends on who purchased the popcorn.