EXPLANATION
Onerous: burdensome
A) Possession: the state of having, owning or controlling something
B) Proud: full of pride; highly creditable; arrogant
C) Droll: amusing
D) Burdensome: oppressively; onerous, distressing; troublesome
E) Sly: acting or done in a secret, often deceitful, way
THE CORRECT ANSWER IS (D)