Answer:
A. Conceptual Model
Step-by-step explanation:
Here the attached model is discussing a complete method to do a scientific experiment through initial observation to final result. The flow chart has been used to explain all the steps which are necessary to be performed, to get a scientific conclusion.
Generally, the conceptual models include the explanation of any method or procedure through the flowcharts. Here this model discusses a concept in step wise manner and shows the inter-relation of its objects through the flowchart.
Reasons for the flow chart, for not being other models are:
A mathematical model should have mathematical calculations, descriptions and languages.
A physical model should have the description of any object or a system like atomic model or solar system representation etc.
A virtual model generally includes the digital and 3D images which are missing.