Question

two ways to explore
l. han

1. carlsbad caverns national park has changed since jim white first explored its caves with his homemade ladder. today, a person can explore its caves in comfort or, if he or she chooses, do it the way old jim did.
2. carlsbad cavern is one of 118 caves that make up carlsbad caverns national park. it is the most famous 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.
3. 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, swayy climbs. spider cave is a limestone maze that gives even experienced cavers trouble!
4. if youre planning a trip to carlsbad caverns national park, be prepared. you never know what you might get yourself into.

which key details support the central idea of the passage?
a the fact that carlsbad caverns is wheelchair - friendly
b the way experienced cavers feel about spider cave
c the descriptions of trips through each cave
d the information about jim whites explorations

Explanation:

The central idea of the passage is about the two ways (easy and difficult) to explore Carlsbad Caverns National Park. Option C, the descriptions of trips through each cave (Carlsbad Cavern and Spider Cave, one easy and one difficult), directly supports this central idea by detailing the different exploration experiences. Option A only focuses on one aspect of Carlsbad Cavern, Option B is about cavers' feelings (not the exploration ways), and Option D is about Jim White's exploration (background, not the main exploration ways now).

Answer:

C. The descriptions of trips through each cave