Why is there a great concern about the 'microbeads' that are released into environment?

Microbeads are non-biodegradable plastic particles less than 5mm in size that bypass wastewater treatment plants and enter water bodies, where they are ingested by marine life and disrupt the entire aquatic food chain. While their small size might suggest they could be absorbed by crops (Option C), they are primarily recognized as a major source of marine plastic pollution rather than a soil-based agricultural contaminant. The core concept tested is the environmental impact of microplastics and their role in bioaccumulation within marine ecosystems.