The use of dolphin-safe nets for catching tuna was started because of

a. letters to tuna companies

b. the earth summit

c. letters to government agencies

d. international treaties

Answer;

A. letters to tuna companies

The use of dolphin-safe nets for catching tuna was started because of letters to tuna companies.

The use of dolphin-safe fishing methods was started because lots of dolphins were drowning in nets used to catch yellow fin tuna. The method was a new plan that the US had created in order to increase the tuna shortage that was happening in the country.

The correct answer is option A, that is, letters to tuna companies.

Explanation:

The application of dolphin-safe nets for catching tuna began due to letters sent to the tuna companies. The application of dolphin-safe fishing nets came into force as many dolphins were drowning in nets that were used to catch yellowfin tuna fishes. The approach was a novel plan, which the United States had started in order to elevate the shortage of tuna taking place in the country.