The given statement is true that "the isdigit function will return a true if its argument is a digit between 0 to 9".
As we know that isdigit is a function in C which can be used to check if the passed character is a digit or not.
Even though isdigit function takes an interger as an argument, the character is passed to the function.
It returns a non-zero value if it's a digit else it returns 0.
For example,
It return a non-zero value for '0' to '9' and zero for others.
Hence, the given statement is true that "the isdigit function will return a true if its argument is a digit between 0 to 9".
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