A girl tells her mother she is volunteering at an animal shelter because it makes her feel good, but the truth is that she has been offered extra credit in one of her classes to do so. Her motivation is

1.)a lie
2.)external
3.)idiomatic
4.)idiomatic

EXTERNAL

I disagree. I think her motivation is the extra credit -- therefore external.

I think she doing just for the extra credit so External

I'll be glad to check your answer.

Why are 3 and 4 the same?

I have no idea that's the way it is on the lesson... I think the answer is idiomatic.

Can you explain what idiomatic is ?

http://dictionary.reference.com/browse/idiom

Thank ya kindly Ms. Sue =)

You're very welcome, Lexi.

d is supposed to be internal