A. On the day of graduation I found out, that I was not going to be valedictorian after all.

    B. On the day of graduation, I found out that I was not going to be valedictorian after all.

    C. On the day of graduation I found out that I was not going to be valedictorian, after all.

    D. On the day of graduation I found out that I was not going to be, valedictorian after all.