A. खाद
B. अजैव निम्नीकरणीय पदार्थ
C. कृमि खाद
D. बायोडिग्रेडेबल पदार्थ

Solution

B. Non-biodegradable substances

Explanation

Those substances that cannot be decomposed by natural process, or if they can than the process is very slow are non-biodegradable substances.