. . . . . . . . higher you climb . . . . . . . . colder it gets. A. the, no article B. no article, no article C. no article, the D. the, the

The correct answer is:

• The higher you climb, the colder it gets.

The article “the” is used before the comparative form of an adjective when the comparison is between two specific things. In this case, the two specific things being compared are the height of the climber and the temperature. The climber is climbing higher, and the temperature is getting colder.

The other options are incorrect because they do not use the article “the” correctly.

• No article, no article: This option does not use any articles. However, the comparative form of an adjective is usually used with an article.
• No article, the: This option uses the article “the” after the comparative form of an adjective. However, this is not correct. The article “the” is only used before the comparative form of an adjective when the comparison is between two specific things.
• The, the: This option uses the article “the” twice. However, this is not correct. The article “the” is only used before the comparative form of an adjective when the comparison is between two specific things. In this case, the two specific things being compared are the height of the climber and the temperature. The climber is climbing higher, and the temperature is getting colder.