Which Statement Best Describes How Flight and Feathers Are Related

Which statement best describes how flight and feathers are related in the evolution of birds?

A) The first flying birds did not have feathers, which evolved later.
B) Feathers and flight evolved at the same time.
C) The first feathered ancestors to birds did not fly but may have used their feathers for insulation and display.
D) Feathers are soft and do not leave fossils or fossil traces, so it is unknown which organisms first had feathers.