Natural selection work's at the individual level, selecting those individuals who will more likely be able to contribute their genes to the gene pool of future generations. Therefore, an organism's is determined mainly by how many offspring they produce throughout their lifetime.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.

i believe the answer is a or 1

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.