I'm trying to answer the following question, but I'm not sure of which one is correct.
A glider is gliding with constant angle of attack along its path. We can assume the hypothesis of small angles. Under these conditions, the following has to be fulfilled:
a) None of the other answers is correct.
b) $C_L=C_{Lopt}$
c) $\hat{D} =$ constant
d) $\alpha=\alpha_{max}$
e) V must remain constant
Note: D with hat means dimensionless drag.
I've been trying to discard some of them but I'm still doubting about if the correct answer is (a) or (e). Can you help me guess which one is the right one?