Can I publish a paper from a work group that I happened to work on it alone?
I suggest that you be extremely careful about this. One of the most distasteful tasks of an Editor is to sort out claims of authorship in articles that have been published. You need to resolve this completely, otherwise it may be disastrous.

In resolving authorship, you must try to contact all your group mates and receive from them some acknowledgement that they wish to proceed as you suggest. If they do not agree, then I suggest that you think twice about continuing. You do not want this issue to spill over into the public arena.

You have to consider, too, the implications of your actions. What does this publication mean for the original assignment? Could the publication of this work retroactively impact on the grades of you and your colleagues? Let me be blunt -- could their grades for this assignment be reduced to zero, adversely affecting their marks, because the publication resulted in a review of your assignment? Now you could potentially be in double trouble!

Finally, say they did agree to allowing you to proceed, you might acknowledge them in your paper just the same.