Answer: Option A
Flexible : capable of bending easily without breaking.
Proud : feeling deep pleasure or satisfaction as a result of one's own achievements, qualities, or possessions or those of someone with whom one is closely associated.
Separable : able to be separated or treated separately.
Rigid : unable to bend or be forced out of shape; not flexible.
Resilient : (of a substance or object) able to recoil or spring back into shape after bending, stretching, or being compressed.
Synonym of Resilient is Flexible