The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south and is bounded by the continents of Asia and Australia in the west and the Americas in the east.
The answer would be C. Ecotourism
I am not a whole 100% sure on that though
Opportunity cost refers to a value that a person could have have received but which the person gave up in preference for another value. It is also called alternative cost. In the scenario given above, Harry decided that the most important commitments for him are to go over to his parent's house and to attending his friend's birthday party. But eventually, he gave up going to his friend's birthday party and go to his parent's house instead. So the opportunity cost in this scenario is the friend'd birthday party which Harry gave up.
The first sentence of the Constitution is called the preamble. We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defense, promote the general Welfare, and secure the Blessing of Liberty to ourselves and our Posterity.
I hope this helps you.