Which of the following expression contains only like terms?5x2 + 4x3 + 3x2 , 5xy - ­7xy +11xy, -­5x3 y2 - ­5x3y4 ­- 5 x3 y3

• A. 5x2 + 4x3+3x2
• B. -­5x3y2 ­- 5 x3 y -­ 5x3 y3
• C. 5xy – 7xy + 11xy
• D. -­5x3 + 5xy