Jane and William will represent our school at the modern arts convention, for their creations have been outstanding this semester.
convention, for their creations have been outstanding this semester
convention, their creations in this having been outstanding this semester
convention; their creations this semester have been outstanding
convention; they having been outstanding in their creations this semester
convention, for they have this semester done outstanding creations
Please tell me what is wrong with answer choice A.OA: