What Is the Key Difference Between Twin Studies and Adoption

Multiple Choice

What is the key difference between twin studies and adoption studies?

A) Twin studies involve identical twins, while adoption studies involve fraternal twins.
B) In twin studies, the effects of the environment are not taken into consideration.
C) In adoption studies, twins are separated at birth, adopted, and raised apart.
D) Adoption studies involve non-twin biological siblings raised by different families.