With respect to value of BOD, arrange the following in descending order._ans_key_i) Distilled water ii) Tap water_ans_key_iii)Industrial effluent iv)Sewage discharge in the river

• A. i– ii – iii - iv
• B. iii –iv – ii - i
• C. iv –iii – ii - i
• D. ii – I – iv – iii