Which data type is used to store a single character in Java?

Answer: Option A

The correct answer is Option A: char.

In Java, the char data type is used to store a single character. It can hold any single Unicode character, including letters, digits, and special symbols.

Using char allows you to store individual characters like 'A', '7', '$', etc., whereas String (Option B) is used to store a sequence of characters (a string of characters).

Options C and D are not valid data types in Java.