The correct answer is A. A step-by-step process, such as a math formula or a scientific technique
Step-by-step explanation:
The word "explanation" refers to a text that provides details in order to understand something. Additionally to this, explanations can be of many types including process explanation in which the main purpose is to provide details to make clear the way a process is, which in most cases implies explaining or providing information about each one of the steps or stages that belong to a certain process, an example of this is the water cycle explanation process. Considering this, the statement that describes a process explanation is "A step-by-step process, such as a math formula or a scientific technique" because as mentioned process explanation is about giving information about all the steps or stages that are part of a process and this is the case of math formulas and the scientific technique process.