Premise: For the past two years, the unemployment rate in Country X has been five percent. This year the unemployment rate is projected to reach seven percent.
Conclusion: Compared to previous years, more citizens of Country X are now unable to find employment.
We need to weaken the above conclusion.
(A) The government of Country X announced this year the addition of 10,000 new public-sector jobs in order to offset lost jobs in the private sector. - Irrelevant. We are not concerned about new job addition.
(B) Even at seven percent, the unemployment rate of Country X is well below that of Country Y. - Again irrelevant. We are not concerned about country Y.
(C) Five years ago the unemployment rate for Country X was three percent, the lowest in the region. - Incorrect. We are not concerned about the situation 5 years ago.
(D) Even though the unemployment rate rose this year, the average hourly wage remained steady.- Irrelevant. We are not concerned about the average hourly wage.
(E) A new means of counting the unemployed that includes those aged 16 - 18 was introduced only this year. - Correct. Could be one such reason where an additional group of people is included thus increasing the set size.
IMO E