Questions please help!

<p>Hi guys, I have a lot of SAT questions that I myself cannot explain. Please help me answer them. Thanks a lot!!</p>

<ol>
<li><p>a<b<c<d<e
p=abcde
in the inequality and the equation above, a,b,c,d,e are positive integers. When just one of these integers is increased by 1 and multiplied by the other four, the new product is n. The difference (n-p) is greatest when which of the five integers is increased by 1?
A. a B. b C.c D.d E. e
The correct answer is A but I thought it must have been E. Anyone explain this for me?</p></li>
<li><p>The city (of Conway), Wales, (now surrounds) the medieval walls and castle that (originally enclosed) and protected (it).
The correct answer is No Error. I thought it should be: the city of conway is now surrounded by....?</p></li>
<li><p>Architect Maya Lin wants people to experience her commemorative monuments tactilely; that is, she wants them to ____ these structures.
A. interpret B. envision C. revere D. confront D. touch.
The correct answer is D. I thought it was "revere"?</p></li>
<li><p>Swimmer Mark was the most decorated athlete of the 1972 Summer Olympics (Games, he won seven gold medals).
A. Games, winning seven gold medals
B. Games by winning seven gold medals
Why A not B?</p></li>
</ol>

<p>Thanks a lot!</p>