Your answer is D.
Because there are no negative reciprocals, therefore there are no right angles.
Given: 

A.)Consider





Also,





Since, 
Therefore, both functions are inverses of each other.
B.
For the Composition function 
Since, the function
is not defined for
.
Therefore, the domain is 
For the Composition function 
Since, the function
is not defined for
.
Therefore, the domain is 
(Credit to guy/girl above) 63 miles 10 1/2 x 6 is 63.