Reading each sentence to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. The letter of that part is the answer. If there is no error, the answer is (d) (Ignore the errors of punctuation, if any).
`("Inspite of all efforts to eradicate malaria")/a` `("it still prevalent")/b` `("in many parts of India.")/c` `("No error")/d`

Explanation

(b) Use .it is still prevalent.