According to the 10% rule, it is healthiest to
from the highest trophic levels.
from the lowest trophic levels.
from all the trophic levels.
there are different healthy things to eat from any level, so it depends.

Wow this is phrased rather difficult.

My answer would definitely would probably be "C". 

Remember that the 10% rule only applies towards energy. Since energy is no indication of healthiness all trophic levels are healthy in their own way.

Ithink the answer is d.