Julie walked to her friend's house to spend the afternoon. she walked at 4 mph. when she went home, she ran at 6 mph so she wouldn't be late. What is true about her average speed and average velocity?

A
her average speed is smaller than her average velocity

B
her average speed and her average velocity are the same

C
her average speed is 0, but her velocity is not

D
her average speed is grater than her average velocity