The correct answer is option 4 - South Africa. The Port of East London is located in South Africa. It is a major port city situated on the southeast coast of the country.

Option 1 - England is incorrect because the Port of East London is not located in England.

Option 2 - Ireland is incorrect because the Port of East London is not located in Ireland.

Option 3 - East coast of USA is incorrect because the Port of East London is not located on the east coast of the United States.

Therefore, the correct answer is option 4 - South Africa. The Port of East London is an important port in South Africa, situated on the southeast coast of the country.