B. People who walk through the door is considered as the primary factor to forecast.
Explanation:
Forecasting is defined as the process of estimating about the future events or happenings. The predictions are done based on the past and present data. Lot of analysis is performed to estimate forecasting.
Forecast means announcing something before it happens. The primary factor to forecast is people who walk through the door. Consider the scenario, if manager and team leader were discussing about the appraisal, and when one of teammates passing by listened to their conversation. He just forecast the conversation regarding appraisal to other team members. This act of the person is known as forecast.
