Answer:
Adjective clause; sport.
Step-by-step explanation:
An adjective clause is a type of clause that modifies or describes a noun in a sentence. It is also known as a relative clause and is a dependent clause, meaning, it cannot stand on its own as a full sentence.
In the given sentence, the subordinate clause used is an adjective clause that modifies the word "sport". The subordinate clause is "that is played in the countries around the world", containing a verb and a subject, thus making it an adjective clause and also modifying the noun "sport".
Thus, the correct answer is the last option.