In 2002, according to a news poll, 36% of the voters had leaning towards party “Y”. In 2004, this figure rose to 46%. But in another survey the percentage was down to 40%. Therefore, the party “Z” is likely to win the next election. Which of the following, if true, would seriously weaken the above conclusion?

Conclusion: the party “Z” is likely to win the next election

Option A: People tend to switch their votes at the last minute, still they can give vote to any party, thus the party Z might win the election.

Option B: Even if the given scenario turnout, still party X will have the majority.

Option C: This statement will weaken the main argument of the passage as it contradicts the prediction of the chances of winning.

Option D: Still election can turn out in any direction. 

Option C is correct.