A and B are two events such that P(A)=0.54,P(B)=0.69 and $P(A\cap B)=0.35$.Find $P(A\cup B)$

Question

$\begin{array}{1 1}(A)\;0.88\\(B)\;0.78\\(C)\;0.98\\(D)\;0.48\end{array} $