In the following question, out of the four alternatives, select the alternative which will improve the underlined part of the sentence. In case no improvement is needed, select “No improvement”. A major river in the city was reduced to a polluted and dirty canal after tonnes of sewage make way into it over the years.?

Option 2 : made

The correct answer is option 2 i.e. made

[ alt="clipboard" src="//storage.googleapis.com/tb-img/production/20/08/clipboard.png" style="width: 38px; height: 38px; float: left;">Let's look at the following points-

• Looking at the given context we find that the given sentence is in 'Past Tense' 
• Therefore, Verb should be used in Past Tense i.e. made; all other options do not fit in the context and are grammatically incorrect

Hence we find that the only correct option that can be used here is Option 3 Yourself which is the right answer. 

The correct sentence- A major river in the city was reduced to a polluted and dirty canal after tonnes of sewage made way into it over the years.