下列词语中没有错别字的一组是（ ）

Now that we’ve discussed our problem, are people happy with the decisions _____?[ ]

It’s his own ______ that he failed in yesterday’s interview.

Listen! There is a knock on the door. Who_____ it be—It must be Jack. Just now I sent for him.

Physics _________much easier for me since Mrs. Yang began to teach us.