The correct answer is A. Contains method.
The Contains method is a string method that checks if a specified string is contained within the current string. The syntax for the Contains method is:
string.Contains(string)
where string is the string to be searched for.
For example, the following code checks if the string “hello” is contained in the string “world hello”:
if ("world hello".Contains("hello"))
{
Console.WriteLine("The string 'hello' is contained in the string 'world hello'.");
}
The output of the code is:
The string 'hello' is contained in the string 'world hello'.
The Contains method is a very useful method for checking if a string contains a specific sequence of characters. It is often used in conjunction with other string methods, such as the IndexOf method, to find the location of a specific sequence of characters within a string.
The other options are incorrect because they do not refer to a valid string method.