Final answer:
There is no data provided to determine how many people David asked about his sweater; the references given do not offer relevant information to answer this question.
Step-by-step explanation:
Based on the information provided, there is no specific content loaded that mentions how many people David asks if they like his sweater. The question seems to be referencing a scenario or a passage not included in the provided reference information. Therefore, without additional context or text, it's not possible to determine accurately how many people David has asked. The information given discusses a classroom exercise about the number of sweaters owned, the expression of emotion on David's face in an image, and a survey conducted in a special T-shirt store. None of these pieces of information reveal anything about David asking others about their opinion on his sweater.