A. Vatican City
C. San Marino
Explanation :A landlocked country is defined as a country that is completely surrounded by land. Some of these nations may have coastlines, but these are only on closed seas. Forty-nine – or about one-fifth of all of the countries in the world – are landlocked.
The largest landlocked country by population is Ethiopia, which has a population of over 101 million people. Vatican City is the smallest by population, with a total population of less than 1,000 people.