(a) all living organisms
(b) non-living objects
(c) both living organisms and non-living objects
(d) sometimes living organisms and sometimes non-living objects
Correct option – ( c )
Explanation for correct option – an ecosystem consists of living organisms as well as non living objects and their interaction with each other
Explanation for incorrect option – living organisms and non living objects together constitutes the ecosystem . It cant be framed by either one of them
Hence correct option is both living organisms and non-living objects