Final answer:
The S.M.A.R.T goal from the given options is option b: "I will increase my monthly sales volume by 20% by the end of March."
Step-by-step explanation:
The S.M.A.R.T goal from the given options is option b. "I will increase my monthly sales volume by 20% by the end of March." A SMART goal should be specific, measurable, attainable, realistic, and timely. This goal meets all of these criteria as it clearly states a specific sales increase of 20% by the end of March, which can be accurately measured. It is also achievable and realistic based on the given information. Lastly, it has a time frame, making it timely.