An analyst writes a report and includes the forecasts of an econometric model developed by the firm’s research department. The analyst identifies the source of the forecast and includes all the relevant statistics concerning the model and his opinion of the model’s accuracy. With respect to Standard Ⅴ (A) , Diligence and Reasonable Basis, the analyst has:（）

A. violated the Standard by including quantitative details in a report. 

B. violated the Standard by giving his opinion of the accuracy of a model developed by his research department. 

C. complied with the Standard.

乙烯—丙烯—异丁烯共聚物，其中乙烯单体为45%、丙烯单体为35%、异丁烯单体为20%，外观为颗粒状