An election with 4 candidates (A, B, C, D) and 150 voters is to be decided using plurality method. After 120 ballots have been recorded, A has 26 votes, B has 18 votes, C has 42 votes, and D has 34 votes. For B to win the election outright, at least how many of the remaining 30 votes need to have B in first place? Explain.