A few reasons are: 1) They contain very little to no chemicals 2) It takes more work to grow, care for, and harvest 3) Majority of farmers produce organic food as a living so it has to be more expensive if they actually want to make a profit
When trying to solve for the cost of each item you will find a rainbow fish is $8.50 and a tetra is $2.50. If you use that information to solve the other answer choices C, D, and E would be correct