#include &lt;stdio.h&gt;     #include &lt;ctype.h&gt;    int main &#40;&#41;    &#123;        int i = 0;        char str&#91;&#93; = &quot;C&quot;;        while &#40;str&#91;i&#93;&#41;        &#123;            if &#40;isalpha&#40;str&#91;i&#93;&#41;&#41;                 printf &#40;&quot;alphabetic&quot;&#41;;            else                 printf &#40;&quot;not alphabetic&quot;&#41;;            i++;        &#125;        return 0;    &#125;
A. alphabetic
B. not alphabetic
C. Error
D. None of the mentioned
Answer:A
#include &lt;stdio.h&gt;     #include &lt;ctype.h&gt;    int main &#40;&#41;    &#123;        int i = 0;        char str&#91;&#93; = &quot;C&quot;;        while &#40;str&#91;i&#93;&#41;        &#123;            if &#40;isalpha&#40;str&#91;i&#93;&#41;&#41;                 printf &#40;&quot;alphabetic&quot;&#41;;            else                 printf &#40;&quot;not alphabetic&quot;&#41;;            i++;        &#125;        return 0;    &#125;
A. alphabetic B. not alphabetic C. Error D. None of the mentioned
Explanation:In this program, We are checking whether the character is alphabetic or not alphabetic by using the function isalpha.