International trade is indeed mutually beneficial to nations, as it allows countries to obtain goods and services they cannot efficiently produce themselves. This benefit arises through trade partnerships, where countries exchange resources, technology, and expertise.
The reason provided is also correct: international trade helps countries obtain the needed items from other countries. Thus, the relationship between the assertion and reason is valid. The reason provides an explanation for why international trade is mutually beneficial.
Thus, the correct option is (A) Both (A) and (R) are true and (R) is the correct explanation of (A).