Sahil got 28 questions right on the math test. Angelina got 7 more wrong answers than Sahil. There were 40 questions on the test. How many answers did Angelina get right on the math test? Which equation represents this situation?
A. a + 7 = 12 B. a + 7 = 28 C. 7 + 12 = a D. 7 = 40 - a