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 isC.

Is the shortest distance= DH+HE+EF+FB(m)?

Can anybody help me to solve this question? Thank you.