Read each sentence to find out whether there is any error in it. The error, if ant, will be in one there is no error, mark 'e' as your answer.
Despite of their best efforts (a)/ they failed to ratain (b)/ the contract due to (c)/ unwanted political interference. (d)/ No error (e).

Answer

a

Explanation

You can use either 'in spite of' or 'despite'. Despite is never followed by 'of'