Find the names of the countries whose condition is sunny.

To find the names of countries where the condition is "sunny," you should use the SQL query SELECT country FROM location WHERE city IN (SELECT city FROM weather WHERE condition = 'sunny'); (Option B). This query correctly uses a subquery to first select the cities with a "sunny" condition from the "weather" table and then matches those cities to the "city" column in the "location" table to determine the corresponding countries. Option B is the appropriate choice for obtaining the desired result.