Correct particle usage: を or は?

Question

I want to say, "Are you sure you want to remove Alex?" Do I use を or は?

    アレックスを削除してもよろしいですか。

Answer 1

1: It's better to use を I think.

Reason: If you say アレックスは削除してもよろしいですか, people will think there are other things/persons that supposed to be removed sometime. In other words, は is just not natural.

2: スタート is correct to use in this circumstance.

Reason: スタート is widely used especially in games and competitions.