please fill in the blanks with mcq answer provided on the right hand side in the picture. Computer language is C.

3.1 Description: Input a positive number n. Calculate s = 1/2 - 2/3 + 3/4 - 4/5 + ......(-1)n-1 n/(n+1) 21) Progam Code: #include int main() { int k, flag=1, n; float s=0; scanf("%d",&n); for (k=1; k void sort (23) ) { Choices: inti, k, j, m, t; 23) A) int a, int n for(i=0; ia[i] k=j; B) a[k]a[j] } A) a[k]=a[i]; a[i]=a[k]; int main() B) a[k]=t; a[i]=a[k]; t=a[i]; { c) t=a[k];a[k]=a[i];a[i]=t; int k, n, a[10); D) t=a[j];a[i]=a[j-1];a[j-1]=t; for(k=0; k int main() Choices: { 27) A) (n=scanf("%d",&n))0 while (27) ); C) scanf("%d",&n), n0 (28) 28) A) i++; n=n/10; } B) n++; printf("%d " ,i); C) n=n%10; return 0; D) i=i+n%10; }