Read the following context and choose the correct option to answer the question.
Context: It may seem as though the 2020 U.S. presidential election is a long way off. But good luck telling that to President Donald Trump or a dozen or so Democrats contemplating a White House bid two years from now.
Trump has already been out on the campaign trail testing themes for his expected re-election bid. "Our new slogan for 2020. Do you know what it is? Keep America great!" Trump told cheering supporters at a recent rally in Elkhart, Indiana.
But Trump also made it clear he is concerned about this year's congressional midterm elections, in which opposition Democrats are favored to make gains.

"And all of the great momentum that we are having as a country on jobs, on safety, on security, on our military — it is all at stake in November," Trump warned at the Indiana rally.

2020 is expected to produce a bumper crop of Democratic presidential contenders who will vie for their party's nomination. Those in the group range from the well-known like former Vice President Joe Biden and 2016 contender Senator Bernie Sanders of Vermont to a younger, less recognizable contingent that includes California Senator Kamala Harris and New York Senator Kirsten Gillibrand.
Several potential Democratic presidential contenders spoke about the party's future at a recent conference in Washington hosted by the Center for American Progress, a Democratic-leaning public policy institute in Washington.
Among the speakers was Massachusetts Senator Elizabeth Warren, who said Democrats face an uphill battle to win back control of Congress this year because of long-standing Republican advantages in winning a majority in the House of Representatives.
"We can't climb that hill by ignoring the millions of Americans who are angry and scared about the damage this president and this Republican Party have done to our democracy," Warren told the conference to a round of applause. "We can't ignore it and we shouldn't want to ignore it."
Question: Who is not expected to campaign for presidential election?
Options:
- Elizabeth Warren
- Trump
- not enough information
- Joe Biden
Elizabeth Warren
The context states that "several" potential Democratic presidential contenders are expected to run. It also names three of these candidates, including Elizabeth Warren and Joe Biden. This suggests that the answer is not Elizabeth Warren or Joe Biden since we know they will be running for president in 2020.
We can eliminate Trump as well because he is already campaigning for his re-election bid according to the quote from him at an Indiana rally: “Our new slogan for 2020…Keep America Great!” The context does not mention any other people who might campaign so it's impossible to say with certainty whether anyone else will do so; therefore, the correct answer option is "not enough information"..