Central America is a long and narrow strip of land which is located between two bodies of water and which connects two pieces of land - we call such a formation an "isthmus" - this is the correct answer.
The Suez canal is also such an isthmus and so is Manila, the capital of the Philippines.
<span>Distribution of mineral deposits would be the answer since 'economy' deals with deposits as the rest of the answers deal with weathering and they don't include an economics. </span>
