The correct option is B NO CHANGE
Some verbs take two objects, a direct object and an indirect object. For
example, in the sentence 'Shaima gave a pen', there is only one object
'pen'. In the sentence 'Shaima gave me a pen', (or 'Shaima gave a pen to
me) there are two objects, 'me' and 'pen', where 'pen' is the direct object
and 'me' is the indirect object.
In the given sentence, "some money" is the direct recipient of the verb "sent", and option A is correct. "We" is the subject, "have sent" is the verb and "to him" is the indirect object. Hence options B, C and D are incorrect.
Note: The direct object answers the question 'what?' and the indirect object answers the question 'to who/whom?'