How do I keep track of score within the functions of my python trivia game?

Question

Let me start by saying that I am new to this and python is my first language so the simpler you can answer the better! Obviously, I cant put score += 1 into the conditional branch of each question's function because of errors with scope. How would I go about keeping track of the score? Would I use another function for score itself?

Here is my code:

answer_a = ['A', 'a']
answer_b = ['B', 'b']
answer_c = ['C', 'c']
answer_d = ['D', 'd']
score = 0

def question1():
    print('What state contains the Statue of Liberty?'
          '\nA. California\nB. Rhode Island\nC. New York\nD. Florida')
    choice = input('> ')
    if choice in answer_c:
        print('\nCORRECT!\n') 
        question2()
    if choice in answer_a:
        print('Incorrect.\n')
        question2()
    if choice in answer_b:
        print('Incorrect.\n')
        question2()
    if choice in answer_d:
        print('Incorrect.\n')
        question2()
    else:
        print('Please select a valid input\n')
        question1()

def question2():
    pass
def question3():
    pass

Answer 1

In Python, you can use global variables to keep track of values such as scores that keep on incrementing.

answer_a = ['A', 'a']
answer_b = ['B', 'b']
answer_c = ['C', 'c']
answer_d = ['D', 'd']
score = 0

def question1():
    global score   #global variable
    print('What state contains the Statue of Liberty?'
          '\nA. California\nB. Rhode Island\nC. New York\nD. Florida')
    choice = input('> ')
    if choice in answer_c:
        print('\nCORRECT!\n') 
        question2()
        score+=1
    elif choice in answer_a:
        print('Incorrect.\n')
        question2()
    elif choice in answer_b:
        print('Incorrect.\n')
        question2()
    elif choice in answer_d:
        print('Incorrect.\n')
        question2()
    else:
        print('Please select a valid input\n')
        question1()

    print("total score is", score)

def question2():
    pass
def question3():
    pass


question1()