Answer:
D. int* ptr;
Explanation:
int *ptr; it is pointer used to hold address of another integer variable.In the options provided we have int ptr that is an integer variable of name ptr.
*int ptr; is wrong this will give error because first we have to write the data type.
int ptr*; is an integer varaible with name ptr*.
int* ptr; is a pointer which can hold the address of another integer varaible.
