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In this sentence, the word "criticised" is correct as it is used in the past participle form to indicate that the marketing strategy has already been criticised.
Thus, option 5 "No improvement required" is correct.
Which of the following statements about black soil is correct ?
Which country will now allow visas for tourists after lifting ban on cinema theatres
Who is the present Governor of RBI?
Where is the Headquarters of the International Fund For Agricultural Development (IFAD)?
Who was responsible for the construction of the Godavari Dam Construction Railway in 1845?
Which country is the top borrower from the Asian Infrastructure Investment Bank (AIIB)?
Where is the Chilkur Balaji Temple located?
Who is the recipient of India's highest civilian award Bharat Ratna for the year 2019?
Bikaner Camel Festival was recently organized in the state of:
Which of the following lists includes examples of cash crops cultivated in India?