C programming fgets help please?

I am given assessment to use fget(not scanf or anything else)I made a menu and when I want to enter a choice fgets doesnt work, it shows error. I am working on it for 5 hours still didnt get it. Even it has not mentioned in textbook in detail about fgets. and

int main(void)

{

int optionStats[NUM_OPTION_STATS];

char choice;

do

{

printf("Menu\n\n");

printf("1. Translating alphabetic number\n");

printf("2. Fibonacci numbers\n");

printf("3. Sort\n");

printf("4. Find substrings\n");

printf("5. Session summary\n");

printf("3. Bushfire\n");

printf("6. Exit\n");

printf("7. Go Again\n");

printf("Enter your chose: ");

fgets(choice,size(choice),stdin);

fgets(choice,sizeof(choice),stdin);<<<<<<<doesnt work

if(choice=='1'){

char input[10];

printf("%s","Enter Alphabetic Phone Number:");

fgets(input,sizeof(input),stdin);<<<<<<doesnt work at all

translateNumber(0, input);

char c[1];

printf("\nPress enter to continue..");

fgets(c,1,stdin); <<<doesnt work

}

while(choice!='7')