Critical Reasoning (CR) | Re: The advent of low-cost freight and shipping

The advent of low-cost freight and shipping has allowed businesses to locate closer to areas ideal for human resources - places where talented people live or want to live - and farther from areas that provide them their most important natural resources. Take the example of Allied Iron Works, which recently moved its operations from Eastern Pennsylvania to San Francisco.

Which of the following is an assumption required by the argument?

A) More people want to live in San Francisco than in Eastern