Read each sentence to find out whether there is any error in any part She told her teacher that she (a)could not be able to attend the class the (b)am previous day because of heavy rains.(c)No error.(d)

The phrase ?could not be able? needs to be replaced with ?was not able? to make the sentence correct. As the action has already taken place so use of modal is incorrect. Thus, the correct sentence would be, ?She told her teacher that she was not able to attend the class the previous day because of heavy rains?.