Answer:
A.
Explanation:
A. Smartphone headphone is the correct answer, because complementary goods are goods that sell together so, smartphone and headphones are complementary goods.
For a smartphone, the best complementary good is smartphone headphones. Therefore, Option A is correct.
Goods that are best when put together and provide complementary service to the customer that provides more comfort to the customer are termed as complementary goods. In other words, the usage of both the products will provide happiness to the customer.
In the case of smartphones, it is best when the headphones that support the smartphone are also available with it as a complementary product. From the point of view of a customer, when the headphones are available, they will be complementary to them.
Therefore, Option A is correct.
Learn more about complementary goods from here:
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