which word signals a problem?\nactually\nprocess\ndifficult\nexplicable

which word signals a problem?\nactually\nprocess\ndifficult\nexplicable
Answer
Brief Explanations:
"Actually" is a discourse - marker, "process" refers to a series of actions, "difficult" implies a level of challenge. "Inexplicable" means unable to be explained, which often signals the existence of a problem as something that cannot be accounted for is a matter of concern.
Answer:
inexplicable