While Flying Horizontally in an Airplane,you Notice That a String

Multiple Choice

While flying horizontally in an airplane,you notice that a string dangling from the overhead luggage compartment hangs at rest at 15° away from the vertical toward the front of the plane.Using this observation,you can conclude that the airplane is

A) moving forward.
B) moving backward.
C) accelerating forward.
D) accelerating backward.
E) not accelerating because the string is at rest.