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.
Because of his prolonged illness (a)/ he could not concentrate (b)/ on his studies although (c)/ he was very much desired to do so. (d)/ No error (e).

Answer

d

Explanation

Replace 'desire' with 'desirous' because an adjective is required to qualify the subject 'He'.