Which two fraternities existed before the founding of Delta Kappa Epsilon?

The correct choice highlights the historical context surrounding the founding of Delta Kappa Epsilon in 1844. Alpha Delta Phi and Psi Upsilon were both established prior to DKE, with Alpha Delta Phi being founded in 1826 and Psi Upsilon in 1833. This fact is significant because it emphasizes the legacy and traditions that influenced the formation of DKE and reflects the early development of the fraternity system in the United States.

Other fraternities mentioned in the remaining options were founded after DKE was established, making them irrelevant in answering the question about the two fraternities that preceded it. By understanding the timeline of these organizations' founding dates, one can appreciate the historical significance and the continuity of fraternity culture leading up to the establishment of DKE.