Answer: The answer is 5 (D)
Step-by-step explanation:
Block 1 has only 1 different type of species
Block 2 has only 2 different types of species
Block 3 has only 2 different types of species
Block 4 has only 3 different types of species
However Block 5 has 3 different types of species, but they are all of equal size or abundance.
In Block 4 pink and blue are a minority and so the species abundance is low (while the species richness is equal to block 5), block 5 has a higher species abundance and an equal species richness than block 4.
I also just took the test and got it right