why is the answer a?

19. For any string s, len(s 0) is equal to 0. What does this code draw when run? import turtle for n in range(2): turtle.color('red' * (n % 2) + 'blue' * ((n + 1) % 2)) turtle.begin_fillo for i in range(5): turtle. fd(50) turtle.lt(90) turtle.end fill() turtle.rt(90) (A) A blue square followed by a red square (B) A red square followed by a blue square (C) Two red squares (D) Two blue squares (E) Neither of the two shapes are squares