It depends on your learning type (kinetic, visual, auditory, etc.) however most evidence proves that A.) quizzing yourself would be the best answer
I think you forgot to put the picture on?
Answer:
C. I'm studying Spanish because I've always wanted to visit Spain, and because my Spanish-speaking friends can help me.
Explanation:
'Spanish' is the name of the language; it requires capitalization regardless of its function as a noun or as a hyphenated adjective.