CarStore's sales personnel have an average of fifteen years'

the new training program would be necessary if the experience in sales is not sufficient. e.g. new cars with new features/electronics that require training to understand.

A) The sales personnel in CarStore have historically specialized in aggressively selling automobiles and add-on features.
well, this does not explain the reason why every employee needs to get trained.

B) Salespeople at other local dealers average 10 years' experience.
out of scope. we are interested only with employees at CS.

C) It is common for new or less experienced employees to participate in training programs.
the argument discusses all employees, not new or less experienced. - out.

D) Pricing information, which used to be confidential, has recently been released on the internet, and many customers try to negotiate lower prices using this data.
Looks good. If the customers try to negotiate lower prices, then everyone would need to be trained how to negotiate so that to not lower the price.

E) Several retailers that compete directly with CarStore use "customer-centered" sales approaches.
does not explain why everyone needs to go through training program.

D for me.