The correct option is A Monera and fungi
Decomposers are organisms that can’t make their own food. In order to survive, they feed on the dead and decaying matter. Fungi and a few species of bacteria are saprophytes. And bacteria belong to the kingdom Monera. And therefore, the option "Monera and fungi" is the correct answer.
Plants are autotrophic and create their own food and hence the option "Fungi and plants" is wrong.
Animals are heterotrophic or depend on plants or other animals for their food. And hence, the options "Protista and Animalia" and "Protista and Mogna" are incorrect.