Which of the following options is the closest in the meaning to the word…

Answer: Incomprehensible. "Inexplicable" describes something that cannot be explained or is hard to understand; "incomprehensible" means not able to be understood, so it is the closest match.

Brief explanations of the choices:

• Incomprehensible — means not able to be understood; this matches the sense of being unexplainable or difficult to grasp.

• Indelible — means cannot be removed or forgotten (permanent); this is about durability, not explainability.

• Inextricable — means impossible to separate or escape from; relates to entanglement or tight connection, not to being unexplainable.

• Infallible — means incapable of making mistakes or being wrong; this concerns reliability, not lack of explanation.

Key tip: Focus on the core sense of the target word (unable to be explained or understood) and pick the option whose definition most directly matches that sense.