context: Rolling with the momentum from the previous week's upset, the 49ers took on the playoff-bound Buccaneers as their final home game of the season, and of perennial pro-bowler Bryant Young's career. With the Buccaneers clinching their division in Week 15, and no improvement in their seed in sight, they treated it as a glorified exhibition game by resting the majority of their starters after the first few drives. Although it wasn't an important game in the standings for either team, the 49ers had their pride - and maybe their head coach Mike Nolan's job - on the line, and the Bucs wanted to make sure that their momentum and edge keeps up as they enter the playoffs. The game came down to a matter of inches, as the Buccaneers final touchdown with 80 seconds remaining led to a failed 2-point attempt that would have been a tying score; receiver Michael Clayton caught the pass in the back of the end zone but half of his foot came down out of bounds.
question: What part of Michael Clayton's body caused him to fail to score a 2-point attempt?
answer: his foot