#include &lt;stdio.h&gt;    #define foo(m, n) m ## n    void myfunc&#40;&#41;;    int main&#40;&#41;    &#123;        myfunc&#40;&#41;;    &#125;    void myfunc&#40;&#41;    &#123;        printf&#40;&quot;%d\n&quot;, foo&#40;2, 3&#41;&#41;;    &#125;
A. 23
B. 2 3
C. Compile time error
D. Undefined behaviour
Answer:A
#include &lt;stdio.h&gt;    #define foo(m, n) m ## n    void myfunc&#40;&#41;;    int main&#40;&#41;    &#123;        myfunc&#40;&#41;;    &#125;    void myfunc&#40;&#41;    &#123;        printf&#40;&quot;%d\n&quot;, foo&#40;2, 3&#41;&#41;;    &#125;
A. 23 B. 2 3 C. Compile time error D. Undefined behaviour