**Core Concept**
Temporary social groups refer to informal groups that form and dissolve over time, often in response to a specific need or situation. These groups are typically characterized by a lack of formal structure and a focus on achieving a particular goal or completing a task.

**Why the Correct Answer is Right**
Temporary social groups are formed to accomplish a specific objective, such as completing a project, responding to a crisis, or providing support during a difficult time. They are often composed of individuals who share a common interest or goal, but may not have a pre-existing relationship.

**Why Each Wrong Option is Incorrect**
**Option A:** Not all social groups are temporary, but this option is not the correct choice for this question.
**Option B:** This option is a type of temporary social group, often formed to accomplish a specific task or goal.
**Option C:** This option is also a type of temporary social group, typically formed to respond to a specific need or situation.

**Clinical Pearl / High-Yield Fact**
Temporary social groups can be an effective way to mobilize resources and achieve a specific goal, but they can also be challenging to manage and may not be sustainable in the long term.

**Correct Answer: D.