The correct answer is C. Mischievous. The correct spelling is mischievous.
A. Miscellaneous is an adjective that means "of, relating to, or consisting of a variety of things." It is spelled correctly. B. Precarious is an adjective that means "in a dangerous or precarious position." It is spelled correctly. D. Licentious is an adjective that means "having or showing a lack of moral restraint." It is spelled correctly.
Mischievous is an adjective that means "causing or showing a tendency to cause trouble or annoyance." It is spelled incorrectly. The correct spelling is mischievous.