Answer:
C. Whenever demand surges, there are material shortages, and equipment failure
Step-by-step explanation:
The safety capacity is developed for the events that are not predicted. It can be used for various things like - shortage of materials, break down of machinery and equipment, the power supply is not available at the current time.
Therefore in the given case, option C is chosen as it fits the current situation
Hence, the other options are to be ignored