Final answer:
Crops grown in Colorado are most likely to have a high concentration of selenium due to the state's known areas with high soil selenium levels.
Step-by-step explanation:
Crops grown in states with higher soil selenium levels are likely to have a higher concentration of selenium. When considering the states provided - Maine, Colorado, Florida, and Arizona - one needs to take into account the typical soil composition and agricultural trends of these regions. Colorado is known to have areas with high soil selenium levels, which is linked to the geological selenium deposits in the state. This suggests that crops grown in Colorado are likely to have a higher concentration of selenium as opposed to the other states listed.