The correct answer is A. x
.
The x
key is used to delete the character beneath the cursor. It is a common shortcut key used in many text editors and word processors.
The X
key is not used to delete the character beneath the cursor. It is used to delete the word to the left of the cursor.
The dd
key is not used to delete the character beneath the cursor. It is used to delete the current line.
The D
key is not used to delete the character beneath the cursor. It is used to delete the selected text.
None of the above is not the correct answer.