3 1 pts An autoshop uses a standard cost system and finds that the labor quantity. variance for the oil used in providing oil changes to customer vehicles is favorable for the month of December. Which of the following could have caused this variance to be favorable? (Choose all that apply.) The average time the workers spent on each oil change was more than budgeted The autoshop did more oil changes than budgeted The workers were paid less per hour than budgeted The autoshop did fewer oil changes than budgeted The workers were paid more per hour than budgeted The average time the workers spent on each oil change was less than budgeted