Answer:
It seems like the teacher is the one who is late.
Step-by-step explanation:
Misplaced modifiers are the modifiers that are misplaced or placed in such a way that they are far from the noun they intend to modify. In other words, modifiers placed away from the intended noun and seem like they are modifying another word are known as misplaced modifiers.
In the given sentence, the modifier "that was late" was intended for Keiko's project. But rather, it is placed next to the noun "teacher" making it seem like it is the teacher who's late. This is a case of a misplaced modifier.
Thus, the correct answer is the third option.