Despite Then-Senator Barack Obama's High Favorability Ratings,why Were Democrats Concerned

Despite then-Senator Barack Obama's high favorability ratings,why were Democrats concerned about his securing electoral victory?

A) They were concerned that white Americans may not support an African American candidate.
B) John McCain and his vice presidential pick were a dream team combination.
C) John McCain had more executive experience than Barack Obama.
D) Barack Obama had little name recognition.
E) President George W. Bush's approval ratings were on the rise toward the end of his presidency.