Add, subtract, and multiply polynomials

An expression is shown
      -3a(a + b - 5) + 4(-2a + 2b) + b(a + 3b - 7)

Which expression is equivalent to the expression shown?
A.)  -11a² + 3b² - 2ab + 7a + b
B.)  -11a² + 3b² - 4ab + 7a  = b
C.)  -3a² + 3b² - 2ab + 7a  + b
D.)  -3a² + 3b² - 4ab + 7a + b

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-3a(a + b - 5) + 4(-2a + 2b) + b(a + 3b - 7)
= -3a² - 3ab + 15a - 8a + 8b + ab + 3b² - 7b   {used distributive property}
= -3a² + 3b² - 2ab + 7a + b   {combined like terms}

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