23. Tingginya konsentrasi zat -zat berbahaya yang terkandung dalam air mengakibatkan pencemaran air. Pencemar an air dapat diakibatk an oleh aktivitas manusia __ A. pembuangan limbah ke sungai atau sumber air B. penebangan hutan secara liar C. pembakaran untuk pembukaan lahan baru D. penggunaan bahan bakar fosil

A

This question asks us to indicate which human activity would result in water pollution. We are given four choices:A. Discarding waste into rivers or water sources.B. Illegally logging forests.C. Burning for the creation of new areas.D. Using fossil fuels. Though all these activities are detrimental to the environment, the question specifically asks about the cause of water pollution, and thus the correct answer is A.