c
Let $A^{T}=A$ and $B^{T}=-B$
$C=A^{2} B^{2}-B^{2} A^{2}$
$C^{T}=\left(A^{2} B^{2}\right)^{T}-\left(B^{2} A^{2}\right)^{T}$
$=\left( B ^{2}\right)^{ T }\left( A ^{2}\right)^{ T }-\left( A ^{2}\right)^{ T }\left( B ^{2}\right)^{ T }$
$= B ^{2} A ^{2}- A ^{2} B ^{2}$
$C ^{ T }=- C$
$C$ is skew symmetric.
So $\operatorname{det}(C)=0$
so system have infinite solutions.