Please answer the following question by reasoning step-by-step.
Given the sentence "Shoppers walking on a busy city street." is it true that "Shoppers walking on a big city street."?

it is not possible to tell
Just because shopping are walking on a busy city street does not mean it is a big city street.

They could be walking down a busy alley that is very small.

.

So, the final answer is it is not possible to tell