I believe it is the third option but it could be the fourth.
Answer:
The first thought the colleagues had was how they could benefit from the empty position.
Explanation:
The colleagues were together in a room when the discussion was interrupted to announce Ivan's death and the thought the colleagues had was about the changes that could happen among them and the benefits.
Answer:
I can not and will not live without music. Music is my life. When words can't explain things music always can.
Explanation: