Question

and the easiest to explore. over the years, it has been paved, lit with electric lights, and made wheelchair-friendly. today, a person can tour its many rooms without even breaking a sweat.

1. spider cave is another of the 118 caves, but dont mistake its level of difficulty. its not a leisurely stroll. people who explore spider cave will find no lights, no sidewalks, and no mercy. a trip through spider cave is a series of tight, dirty crawls followed by high, sweaty climbs. spider cave is a limestone maze that gives even experienced cavers trouble!
2. if youre planning a trip to carlsbad caverns national park, be prepared. you never know what you might get yourself into.

how does the author share the central idea of paragraph 3?
a by saying that spider cave is dirtier than most caves
b by describing spider cave as just one of many caves
c by saying that spider cave has no lights or sidewalk
d by claiming that spider cave is easy to explore

Explanation:

The paragraph emphasizes the difficulty of Spider Cave. Options A and B do not directly relate to the central idea of difficulty. Option D is incorrect as the text says it's not easy. Option C, by stating "no lights or sidewalk", helps convey the challenging nature (as opposed to the easier - to - explore cave mentioned before).

Answer:

C. By saying that Spider Cave has no lights or sidewalk