The % key allows you A. to move the cursor to a matching delimiter, when a delimiters a parenthesis, a bracket, or a brace. B. to move the cursor to the upperleft corner of the screen C. to move the cursor backward to the beginning of a word D. to move the cursor to the first column in the current line E. None of the above

to move the cursor to a matching delimiter, when a delimiters a parenthesis, a bracket, or a brace.
to move the cursor to the upperleft corner of the screen
to move the cursor backward to the beginning of a word
to move the cursor to the first column in the current line E. None of the above

The correct answer is A.

The % key allows you to move the cursor to a matching delimiter, when a delimiters a parenthesis, a bracket, or a brace. For example, if you have the following text:

(this is a test)

And you press the % key, the cursor will move to the closing parenthesis.

Option B is incorrect because the % key does not move the cursor to the upperleft corner of the screen.

Option C is incorrect because the % key does not move the cursor backward to the beginning of a word.

Option D is incorrect because the % key does not move the cursor to the first column in the current line.