Good question! Answer choice A is a valid argument with sufficient and necessary reasoning. However, you have to look a bit closer to see why it does not most closely parallel the argument.
On the basis of previous evidence alone (PEA), it would have been impossible to prove that Jamison was guilty (IPG).
PEA - -> IPG
However, Jamison has been proven guilty. (In other words, not impossible to prove guilt: not IPG)
This leads to a contrapositive of our first diagram. not IPG - -> not PEA
"Not previous evidence alone" is our conclusion. We did not simply invoke sufficient to conclude necessary. Rather, the necessary condition was negated, from which we conclude that the sufficient did not occur. not N - -> not S
There was no negation involved in answer choice A. It did not conclude that the sufficient condition did not occur.
If someone is on the old list (OL), that person could not have purchased the property within the last year (not PWY). OL - -> not PWY
In order for this to match the stimulus, the premise would have to be: Jamison purchased his house within the last year (PWY).