Answer:
A. 0.56
Explanation:
Conditional Probability
We use the conditional probability formula to solve this question. It is

In which
P(B|A) is the probability of event B happening, given that A happened.
is the probability of both A and B happening.
P(A) is the probability of A happening.
In this question:
We want to find
.
We can relate the numbers using
. So


P(H) = 0.70 , P(DH/H) = 0.80
So

The correct answer is given by option A.