You can’t always get what you want” is an example of
a. motif
b. plot
c. theme
d. resolution

Hey!
Ok so let's look at the definition of these answer choices.
You first have
A) Motif, Motific means a design or pattern used in the arts, so we can cross that out! 
B) Plot, A plot of a event is a section were the writer is expressing more into the characters, so we can X that out aswell.
Now we have 
C) Theme. It is the moral of the main point of a story, and C is the correct answer!
And then there is D
D, Resolution. A resolution is when they solve the problem. It is a firm decision to do or to not do something. 
The answer to your question is C.
•❋Korey❋•