Which Is the Best Example of Enrichment

Which is the best example of enrichment?

A) Jewel is 14 years old, but is allowed to enroll in college courses.
B) With a teacher's guidance, Dale researches, designs, and builds a robot.
C) Tosha is given extra reading and math problems because she always finishes early.
D) Since Lynn already knows the algebra content covered in the first 8 weeks in class, she is allowed to begin with content usually introduced later.