Basic research tends to have high ______ validity,whereas applied research tends to have high ______ validity.

A) internal; external
B) experimental; practice
C) external; experimental
D) external; internal

Internal validity relates to the degree to which a study accurately measures or manipulates the variables it intends to. Basic research typically focuses on measuring or manipulating variables to establish causal relationships, and so it tends to have high internal validity.
External validity refers to the generalizability of findings to real-world contexts. Applied research often seeks to test theories in real-world settings, and so it tends to have high external validity.