I calculate the question by this formula: DH+HE+EF+FB
I found the length of DH+FB by Pyth. theorem.
Then, I got the total length of DH+FB is 16.4m
∴DH+HE+EF+FB is equal to 16.4+19+9m =44.4m
But the correct answer is C.
Is the shortest distance= DH+HE+EF+FB(m)?
Can anybody help me to solve this question? Thank you.