Since Fernanda constructed a copy of ∠CAB and labeled it as ∠FDE, and then measured ∠FDE to be 59°, this means that the two angles are congruent by definition (which means they have the same measure). Therefore, the original angle ∠CAB must also measure 59°.
Thus, the correct answer is:
The measure of ∠CAB is 59°.
The measure of angle CAB is 59 degrees.
So the option stating "The measure of ∠CAB is 59°." is the correct answer. The other options incorrectly state the measure of ∠CAB.