#### Answer

Since Candidate A has the highest number of first-place votes, Candidate A is selected as the winner using the plurality method.

#### Work Step by Step

With the plurality method, the candidate with the highest number of first-place votes is selected as the winner. We can find the number of first-place votes for each candidate.
Candidate A: 180
Candidate B: 100
Candidate C: 30
Candidate D: 40
Since Candidate A has the highest number of first-place votes, Candidate A is selected as the winner using the plurality method.