In a lean environment, process problems are more visible than they are in a traditional environment because:
a. the push manufacturing system leads to increased inventory level.
b. the lack of work in process inventory creates problems.
c. process problems cause production to shut down immediately.
d. inventories are maintained at higher levels.

The reason why process problems are more visible in lean environment then they are in a traditional environment because C) process problems cause production to shut down immediately.

Explanation:

Lean manufacturing is a type of business model where the focus is on eliminating the wasteful activities from the production area, warehouse or office etc and because of these activities a business is unable to add value to customer and limits supply chain capacity, and so by eliminating these wasteful activities , a business would want to provide same quality of goods with greater efficiency.

Therefore whenever there are process problems in lean environment, it causes production to shut down immediately because of the lack of inventory.