Many teachers give students "busy" work that they can complete on their own, which allows the teacher to work individually or with small groups during class. This "busy" work falls into the limit of the zone of proximal development.

Lower.

Explanation:

The Zone of Proximal Development was the theory theorized by Lev Vygotsky. The theory suggest the range between the actual development and the potential development based on the tasks performed independently or dependently.

According to this theory, a teacher or an educator is required to assist the students for development.

But in the given case, the teachers are giving students 'busy' work instead of ''skilful' tasks that will help in their development.

So, the 'busy' work will come under the lower limit of ZPD theory. Thus, the correct answer is a lower limit.