A politician delivers a speech outlining a plan to fix the economy. Two days
 later, polls show that fewer voters than ever plan to vote for him in the next
 election. He concludes that his speech on the economy caused this drop in
 popularity. Which of the following, if true, would suggest that the speech was
 correlated, but not a cause, of his changing poll numbers?
 O
 A. The most important issue for voters in the upcoming election is
 improving the economy.
 O
 B. The economic ideas expressed in the speech were thought to be
 highly popular among likely voters.
 O
 C. The politician's opponent delivered a speech criticizing the
 politician's economic plans and became more popular.
 O
 D. The poll shows that the politician became more popular among
 people who were actually aware of the speech.