#include &lt;stdio.h&gt;    #include &lt;math.h&gt;    void main&#40;&#41;    &#123;        int k = fabs&#40;-87&#41;;        printf&#40;&quot;%d\n&quot;, k&#41;;    &#125;
A. -87
B. 87
C. 78
D. error
Answer:A
#include &lt;stdio.h&gt;    #include &lt;math.h&gt;    void main&#40;&#41;    &#123;        int k = fabs&#40;-87&#41;;        printf&#40;&quot;%d\n&quot;, k&#41;;    &#125;
A. -87 B. 87 C. 78 D. error