Answer:
A. It helps managers understand how a firm's external environment affects the firm.
Explanation:
PESTEL is an acronym that stands for Political, Economic, Socio-cultural, and technological. It analyses the environment in which a business operates.
In marketing it has found an application in forecasting market decline and growth, market direction, and potential.
The analysis is an external one that identifies strengths and weaknesses in macro-environmental factors. This knowledge can now be used in SWOT analysis by the business.