Discussion
Which of the following would not follow from fitting anhedral?
Answer: D
Correct answer: Improved lateral stability
Anhedral reduces lateral stability by definition: it subtracts from the dihedral effect, so the rolling moment a sideslip produces is smaller.
The other three do follow from fitting it. The dihedral effect is reduced, which is the direct consequence; the Dutch roll damps better, since the imbalance causing the poor damping is removed; and the spiral mode becomes more divergent, that being the other end of the same trade. Anhedral buys damping at the cost of stability, which is precisely the exchange the designer intends.
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