Explanation:

- Aggregate: This refers to a collection of people who are together in the same place temporarily, without a shared identity or lasting connections. Examples include passengers at a bus stop or shoppers in a mall. Correct!

- Category: This refers to people grouped together based on shared characteristics but who may not be in the same place simultaneously. An example is all people who like soccer.

- Mob: Typically, this is a disorganized or disorderly crowd, often with volatile behavior. It implies a level of chaos, such as in a protest that turns riotous.

- Social Group: This consists of people who identify with each other and interact regularly, like a family or a club.