Choices B, C, and D are correct. Nice work.
Further explanation:
- Choice A is ruled out because we aren't multiplying 5 by 6
- Choice B is correct because 4*5 is the same as 5*4. Similarly, 3(2+6) is the same as 3(6+2). We can add in any order, and multiply in any order. See the commutative property for more details.
- Choice C is correct for similar reasoning as choice B
- The distributive property allows us to go from 3(2+6) to 3*2+3*6, showing that choice D is the same as B and C.
- You can confirm each answer by using a calculator. The result of simplifying the original expression is 44. You should find that expressions B, C and D also result in 44. Only choice A is the one that doesn't fit in since it results in 56.