Identify the error in the sentences given below, if there is no error, mark option ( e ).
(a) When children have difficulty understanding
(b) a certain mathematical prosess, it is often because
(c) their teachers do not understand it conceptually
(d) themselves and do not prosent it in a way that children can understand.
( e ) No error.

Answer

a

Explanation

When children have difficulty in understanding a certain mathematical process, it is often because their teachers do not understand it conceptually themselves and do not present it in a way that children can understand. Therefore, part (a) will take the preposition 'in' after difficulty to be correctly expressed.