What is the sum of all even numbers from 1 to 801?	Select.
A) 160400 B) 281228 C) 281199 D) 122850 E) 128111
Explanation:   800/2= 
<gadget id="calculator">800/2</gadget>
<output>400</output>
400   400 * 401= 
<gadget id="calculator">400 * 401</gadget>
<output>160_400</output>
160400   160400nswer: 160400
<result>A</result>
What is the sum of all even numbers from 1 to 801?