Read the informational passage below:
Lake Champlain, located between Vermont and New York, is home to diverse fish and wildlife. However, agricultural runoff carrying excess phosphorus poses a threat to its ecosystem. High phosphorus levels trigger rapid algae blooms, which deplete oxygen in the water and harm aquatic life.
According to the passage, what is a primary threat to Lake Champlain's ecosystem?
- AAgricultural runoff containing excess phosphorus
- BFreezing surface temperatures during Vermont winters
- COverpopulation of native trout and bass species
- DLack of sunlight reaching the surrounding wetlands