Sarah and Joe are taking the same psychology class. Sarah wants to do well in the class because she is earning credit toward a general education requirement. Joe wants to do well because he loves the material. Sarah wants to do well because of ________ motivation, whereas Joe wants to do well because of ________ motivation.
a) intrinsic;
b) intrinsic extrinsic;
c) intrinsic intrinsic;
d) extrinsic extrinsic;
e) extrinsic