Answer: Dynamic of need
Explanation: There are two words of importance here. Dynamic and need.
Dynamic: when a person, place, or thing is energetic and active, this is know as being dynamic.
When something is dynamic it goes through a lot of process. Example: Someone with a dynamic personality is usually funny.
Need: to require something because it’s important or very essential.
Dynamic of need is when you have a active need of things, this things can be information which are very essential.