What method is used to convert a string to lowercase?

• A. lower()
• B. toLower()
• C. downcase()
• D. string.lower()

Answer: (A)

The method used to convert a string to lowercase in Python is indeed lower().

When you call the lower() method on a string, it returns a new string where all the uppercase letters have been converted to their lowercase counterparts. This is a built-in string method in Python, making it a straightforward and efficient way to modify the case of text.

For example, if you have a string defined as text = "Hello World", using text.lower() would yield the result "hello world".

The other options referenced do not exist in Python's standard string methods. toLower() and downcase() imply a similar functionality but are not recognized in the Python strings class. The notation string.lower() suggests that it may be referencing the method in a more generic way, which can be misleading because in Python, the method should be directly called on the string instance rather than as if it were a function in the string module. Thus, lower() is the clear and correct method to use for converting a string to lowercase.