(A) Republican
(B) ** Democratic
(C) Grass Roots
(D) Independent
EXPLANATIONS BELOW
Concept note-1: -A member of the Democratic Party, he previously served as the 47th vice president from 2009 to 2017 under President Barack Obama, and represented Delaware in the United States Senate from 1973 to 2009. Joseph Robinette Biden Jr. Scranton, Pennsylvania, U.S.
Concept note-2: -He became the presumptive Democratic nominee in April 2020, was formally nominated by the Democratic Party in August 2020, and defeated Republican incumbent Donald Trump in the November 2020 election. Over his career, Biden has generally been regarded as belonging to the mainstream of the Democratic Party.