Which factor is most important?

Order Instructions/Description

 

Dear writer here is the question:
(A variety of factors influence second language acqiuesition L2 such as :
intellegance
aptitude
personality
motivation and attitudes
learner prefrences
learner belifs
age
In your opinion , what is the most important factor in L2 acquisition and Why?)
dear writer I want you to chose motivation and support your answer with evidence why.
also I need an outline for this essay but please the lecturer told us that the outline should not be in full sentences just points.