A firm establishing a manufacturing plant in a foreign country due to the cheap labor costs in that country is an example of the advantage that the firm enjoys.

location

Explanation:

A firm establishing a manufacturing plant in a foreign country due to the cheap labor costs in that country is an example of the location advantage that the firm enjoys.  By establishing a manufacturing plant in a location with cheap labor, the firm saves budgetary allocations for labor, it is fully enjoying the advantage of the location. Several manufacturing firms adopt this method by establishing manufacturing plants in South American or African countries where labor is relatively cheap compared to Europe and United States.

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer