Which of these is a quadratic polynomial...

Which of these is a quadratic polynomial ?
(a) ( `5x^2` + 1)( 5x +1 )
(b) (2x + 4)( x - 3 ) = 2 (`x^2` - x - 6)
(c) ( `x^3` + `x^2` - 6 ) = 2`x^3` = `x^2` - 5x
(d) `( 3x +1)^2` = 3( 3 `x^2` - x - 5 )

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