Final answer:
A study unit for Penn Foster refers to a module or lesson in their program.
Step-by-step explanation:
The correct answer to the question is b) A module or lesson in the Penn Foster program.
A study unit for Penn Foster refers to a module or lesson in their program. Penn Foster is an online educational institution that offers various courses and programs. Each course is divided into different study units, which contain the content and assignments that students need to complete.
For example, in a Business course, a study unit might cover topics such as marketing, finance, or management. Students would complete readings, watch videos, and complete assignments related to these specific topics within the study unit.