If 2s = a + b + c, then the value of s(s c) + (s a) (s b) is

• A. ab
• B. abc
• C. 0
• D. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>a + b + c</center></td></tr><tr><td style="text-align: center;">2</td></tr></table>