Read each sentence to find out whether there is any error in any part That Brutus, who was his trusted friend(a) had attacked on him(b) caused heartbreak to Julius Caesar(c). No error.(d)

?Attacked on him? is the incorrect form of phrasal verb that needs to be replaced with ?Attacked him? to make the sentence correct. This is because; ?Attack? is not followed by any preposition. Thus, the correct sentence would be, ?That Brutus, who was his trusted friend had attacked him caused heartbreak to Julius Caesar?.