Which of the following is a country in Europe?

a
Latvia
b
Mexico
c
Angola
d
All of the above

a) Latvia

The correct answer is "a) Latvia." Latvia is a country in Europe.

To identify which of the options is a country in Europe, we need to evaluate each individual option.

a) The option "a" lacks specificity, so we cannot determine whether it is a country in Europe or not.

b) Mexico, option "b," is not a country in Europe; it is located in North America.

c) Similarly, Angola, option "c," is not a country in Europe; it is located in Africa.

d) "All of the above," option "d," suggests that every option listed is a country in Europe. However, since we have already identified that options "b" and "c" are not European countries, we can conclude that option "d" is incorrect.

Therefore, the correct answer is option "Latvia" (option "b") as it is a country in Europe.