The Operating Profit % for Jatin Limited Has Risen This

Multiple Choice

The operating profit % for Jatin Limited has risen this year. Which of the following statements would not be a potential explanation for the increase in operating profit %?

A) A reduction in the number of administrative staff during the year.
B) A reduction in advertising expenditure this year.
C) A decrease in the cost of raw materials used in production with no corresponding decrease in selling prices.
D) An increase in the returns on bank deposits during the year.