$X$ and $Y$ are two random independent events. It is known that $P(X)=0.40$ and $P\left(X \cup Y^{C}\right)=0.7$. Which one of the following is the value of $P(X \cup Y)$ ?

(A) 0.7

(B) 0.5

(C) 0.4

(D) 0.3

$X$ and $Y$ are two random independent events. It is known that $P(X)=0.40$ and $P\left(X \cup Y^{C}\right)=0.7$. Which one of the following is the value of $P(X \cup Y)$ ?

(A) 0.7

(B) 0.5

(C) 0.4

(D) 0.3

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