Incapable of being explained or accounted for

A. Incredible

B. Inexplicable

C. Inexplicit

D. Inexpressible

Answer: Option B

Solution(By Examveda Team)

One word substitute is Inexplicable.

Incredible: impossible to believe.
Inexplicable: unable to be explained or accounted for.
Inexplicit: not definitely or clearly expressed or explained.
Inexpressible: (of a feeling) too strong to be described or conveyed in words.