The correct answer is be hidden.
B. walk unsteadily
C. watch closely
D. be hidden
The correct answer is (D) To be hidden; to exist secretly or furtively; to exist unobserved; to lie or wait in concealment, to remain in or around a place unnoticed or unsuspected.
Lurk comes from Middle English lurken.
Examples of use:
- A short man of undetermined age lurked near the hedge as twilight came.
- The cat lurked by the rosebush in readiness for the arrival of a careless sparrow or robin.