What type of context clue helps describe meaning of the underlined term

What type of context clue helps describe the meaning of the underlined term?

To the south and southeast of China are the Himalayas. These are the highest mountains in the world. They provided a nearly impassable border for ancient China, keeping the area isolated from many other civilizations.

A. inference

B. restatement

C. antonym or synonym

D. definition or explanation

A. inference

Explanation:

According to the given excerpt, the mountains in China are described and they are said to be the highest mountains in the world and they can be found in the South and Southeast of China.

Therefore, the type of context clue which helps describe the meaning of the underlined term is inference.

This is because, inference is a conclusion that is gotten from a reasoning or evidence.

The underlined term is "impassable"

the correct answer is a