What Is the Advantage of Using a Cold-Adapted Strain of Influenza

What is the advantage of using a cold-adapted strain of influenza A as a vaccine?

A) It spreads between people better than the wild-type.
B) It does not replicate well in the lung tissue.
C) It does not stimulate the release of interferon.
D) It does not cause as much cell damage as the wild-type virus.
E) It is more immunogenic than the wild-type.