a. inorganic nutrients from humus

b. both organic and inorganic nutrients from detritus

c. organic nutrients from humus

d. inorganic nutrients from detritus and formation of humus

Correct option – ( a )

Explanation –mineralization is release of inorganic substances from organic substances . T he process is slow because trapping of the nutrients in humus and their immobilization in decomposers . Hence the process ofmineralisation by microorganisms helps in the release of inorganic nutrients from humus

Hence correct answer is – inorganic nutrients from humus