# If $A,B,C$ are angles of a triangle and $\begin{vmatrix} 1&1&1\\1+\sin A&1+\sin B&1+\sin C\\\sin A+\sin ^2A&\sin B+\sin^2B& \sin C+\sin^2C\end{vmatrix}=0$
$\begin{array}{1 1}(A)\;\text{Isosceles}&(B)\;\text{Equilateral}\\(C)\;\text{Right angled triangle}&(D)\;\text{None of these}\end{array}$