I was pleased as/after/when/whenever I heard the news.
Could you please tell me if they are all correct? If yes what is the difference between them?
I was pleased whenever I heard the news means that you heard the news more than once and you were pleased every time.
I was pleased after I heard the news means you heard the news first and afterwards you were pleased.
I was pleased as I heard the news means that being pleased and hearing the news occurred at the same time.
I was pleased when I heard the news means you were pleased very shortly after you heard the news and you were pleased because of it. In my opinion this is the correct choice.