The correct answer is A. admired.
An obscure cave is a cave that is not well-known or visited. It is not famous or popular, and it is not the subject of much attention.
A cave can be obscure for a number of reasons. It may be located in a remote area, or it may be difficult to access. It may also be small or unremarkable, or it may be associated with negative or dangerous stories.
Despite its obscurity, an obscure cave can still be a place of interest. It can be a place to explore, to learn about nature, or to simply enjoy the peace and quiet.
The other options are incorrect because they do not accurately describe an obscure cave.
A notorious cave is a cave that is known for its bad reputation. It may be associated with crime, violence, or other negative activities.
An infamous cave is a cave that is known for its evil or dangerous reputation. It may be associated with ghosts, monsters, or other supernatural creatures.
A well-known cave is a cave that is famous or popular. It is often visited by tourists and other people who are interested in caves.