From Old English 'ceosan,' from PIE *gews- (to taste) — the original act of choosing was tasting and testing.
To pick out or select from a number of alternatives; to decide on a course of action.
From Old English 'cēosan' meaning 'to choose, seek out, test, taste, try,' from Proto-Germanic *keusaną (to choose, taste, test), from PIE root *ǵews- meaning 'to taste, relish.' The original concept was sensory: choosing was tasting, sampling, testing by putting something to your mouth. The shift from 'taste' to 'choose' reflects how evaluation through the most intimate sense — the sense that determines what enters your body — became the metaphor for all deliberate
The word 'choose' is etymologically related to 'gusto' and 'disgust' — all from PIE *ǵews- (to taste). Choosing was originally tasting: you sampled before you selected. 'Disgust' is literally 'bad taste,' and someone 'choosy' is, at the deepest level, someone with a discriminating palate.