The era of republicans began
select one:

a. at the time of the civil war.

b. during the great depression.

c. with the election of thomas jefferson.

d. after the resignation of richard nixon.

I'm pretty sure that it is C. because Thomas Jefferson created several political parties

The first "anti-Nebraska" local meeting where "Republican" was suggested as a name for a new anti-slavery party was held in a Ripon, Wisconsin schoolhouse on March 20, 1854 DURING THE GREAT DEPRESSION. The first statewide convention that formed a platform and nominated candidates under the name "Republican" was held near Jackson, Michigan on July 6, 1854. It declared their new party opposed to the expansion of slavery into new territories and selected a statewide slate of candidates.

Letter B