electric field and electric potential

1. The problem statement, all variables and given/known data
hi, all, can anyone explain why the ans is C for this question?
http://ift.tt/1hbM3rU

for the second question? shoudnt the ans is D ?
http://ift.tt/1jMs2Hx

2. Relevant equations

3. The attempt at a solution

http://ift.tt/1hbM6nC

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