(A) weakens the above argument to the T.
(B) talks about some of the largest awards being made in the last 2 years .... but this in no way weakens the argument since the argument clearly states that the number of successful suits has remained the same and the average sum has grown no faster. So, if some large awards were made in the last 2 yrs then we can support the argument in context by stating that some smallest awards were also made in the last 2 yrs. So, (B) does not weaken the conclusion.
My vote for (A)