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Sight ..... giving humans 80 % of the information about our outside world.
I believe sight would be the most important since emotion and body language gives you a better interpretation.
Hearing ,as it the most important thing in comunication in order to make review of what you are going to deal with ( customer, subject ,situation) and then you can manage the outcome of the deal .
I would say hearing because i havent met any of my suppliers, all dealing are by phone.
sight
Sight sense is the most important.
Sight is one of the most important human senses.