If the equation $y = x^2 r + M^1 L^1 T^{-2}$ is dimensionally correct,find the dimensional formula of $x^2$. (Here,$r$ represents displacement.)
- A$M^1 L^0 T^{-2}$
- B$M^1 L^1 T^{-2}$
- C$M^1 L^{-1} T^{-2}$
- D$M^0 L^1 T^{-2}$
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