The following information is available for the year ended December 31: Beginning raw martials inventory 2500 raw martials purchase 4000 Ending raw martials inventory 3000 Office supplies expense 1000 The amount of raw materials used in production for the year is: O a. $4,100. O b. $4,000. O c. $5,100. O d. $6,500. O e. $3,500