The following shows stella's answer to a problem on a math test. 3(1 + 2) stella's friend gave the following answer for the same problem. 3 · 1 + 3 · 2 which shows why their answers are the same? \ a. a + bc = (a + b)(a + c) b. a + bc = ab + ac c. a(b + c) = (a + b)(a + c) d. a(b + c) = ab + ac