"Loser" is a word that decribes many things but mostly its a noun
a person or thing that loses or has lost something, especially a game or contest.
synonyms: defeated person, also-ran, the defeated, the vanquished; runner-up
"candidates compete against each other, so there are winners and losers"
a person who accepts defeat with good or bad grace, as specified.
"we won fair and square—they should concede that and be good losers"
a person or thing that is put at a disadvantage by a particular situation or course of action.
"children are the losers when politicians keep fiddling around with education"
1. Is A :) hope that helps!