The correct answer is: A. a space enclosed in double quotes.
A character variable is a variable that can store a single character. It is typically initialized to a space enclosed in double quotes. For example, the following code initializes a character variable named my_char to a space:
my_char = " "
The other options are incorrect. Option B is incorrect because a space enclosed in single quotes is a string literal, not a character variable. Option C is incorrect because the letter O is a character, not a character variable. Option D
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