The correct answer is B) analyzing information.
The activity that is part of developing a fashion forecast is "analyzing information."
It is not selecting or creating models. We are talking about forecasting, which means to look for new information about tendencies in the market, analyzing data, surveys, statistics, in order to identify needs and wants of our costumers and then, prepare and create new designs. During forecasting, Fashion Designers analyze information and prepare marketing strategies to support the launching of new designs.