Option (C) is correct, i need some explaination for why us it corrcet and other 3 is incorrect

IJK, Inc. is a supplier of nonessential low-cost parts to be used in the manufacture of RST Company's products. The companies meet monthly to review deliveries, orders, and any quality issues. These meetings take two hours and involve multiple people from both companies. Which of the following is TRUE in this situation? a) The meetings add value to the relationship between the buyer and seller and should continue under the current schedule. b) The meetings should occur more frequently as a preventative measure to avoid delays in production. c) The meetings should be eliminated and the resources allocated to more important tasks. d) The meetings are critical to both companies' success and should be attended by the leaders of the organizations