Which of the following honors is associated with undergraduate ATO achievements?

The Thomas Arkle Clark Award is specifically designated for undergraduate members of ATO (Alpha Tau Omega) who have demonstrated exceptional leadership and commitment to the fraternity. This award is named after a prominent figure in the fraternity's history, and it acknowledges the significant contributions of undergraduate members to their chapters and the fraternity as a whole. Recipients of this honor often exemplify the values and ideals that ATO promotes, showcasing excellence in character and service.

In contrast, the Outstanding Chapter Award tends to focus on recognizing chapters as a whole for their achievements and excellence in operations, while the Excellence in Leadership Award may encompass broader leadership qualities applicable to various contexts, not limited to just undergraduate achievements. The National Service Award typically highlights service efforts on a national or charitable level rather than individual undergraduate accomplishments. Therefore, the Thomas Arkle Clark Award stands out as the honor most closely tied to the achievements of undergraduate members in ATO.