Elimination is a feature of many voting methods, most commonly RCV, in which some candidate(s) are removed from the election, usually permanently (i.e. they lose).
3 A>BIf A is eliminated, then B wins in any elimination-based method passing the majority criterion. This is because if A hadn't run at all, then the the election would've been
48 B49 C
51 B 49 Cand B would've been preferred as 1st choice by 51 of the 100 voters.