A. remove(var-name);
B. free(var-name);
C. delete(var-name);
D. dalloc(var-name);

Solution

B. free(var-name);

Explanation

The function free() is used to de-allocate the memory allocated by the functions malloc ( ), calloc ( ), etc, and return it to heap so that it can be used for other purposes. The argument of the function free ( ) is the pointer to the memory which is to be freed.