What do jiro and sons believe has affected the availability of high quality tuna? select one: a. global warming b. the proliferation and growing popularity of sushi worldwide c. pollution d. the absence of fishing regulations e. all the above?

I believe the answer is: D.The absence of fishing regulations
The absence of fishing regulations make a lot of fisher able to choose a fishing method that either damage the ecosystem under the sea or using a chemical that may alter the biological composition in the fish, and both of these things reduce the availability of high quality fish.

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