請問美國老土- legally work authorization

讀到你在回複前麵一貼HR的screening問題時,在問到What is your working eligibility status in the US.時,你的回答是I am leagally OK to work for any employer in USA.

請問你之前就知道他的immigration status嗎還是這個可以用做統一的答案?

我現在有H1B, 發現在申請網上的職位時,通常會讓我選擇:

A. I have the right to work for any employer.
B. I have the right to work only for my current employer.
C. I need sponsorship to work for any employer.

這樣的話我應該選哪個呢? 理論上應該是B, 可是聽上去好象比C更麻煩.

謝謝你的回答!