Final answer:
The latest time to call on the East Coast from an office on the West Coast is 2 pm.
Step-by-step explanation:
The latest time to call on the East Coast from an office on the West Coast would be 2 pm according to the options provided. This is because when it is 12 noon on the West Coast, it is 3 pm on the East Coast, since the Eastern Standard Time is 3 hours ahead of Pacific Standard Time.
Therefore, the latest time to call on the East Coast would be 2 pm in order to avoid calling too late in the day.