This question seems to be incomplete. However, there is enough information to find the right answer.
Answer: Your success has been a great pleasure for us.
Step-by-step explanation:
The question requires modifying the sentence by using the noun form of the word 'pleased,' which is the word 'pleasure".
Some versions of this question found online require that the new sentence begins with the phrase "Your success has..."
To form the new sentence, we need to remember that, in the active voice, the subject of the sentence performs the action described by the verb. E.g., We are pleased by your success. On the other hand, in the passive voice, the subject of the sentence is acted upon. E.g., Your success pleases us.
However, in this case, we need to rephrase the sentence to include the word 'pleasure,' so, instead of 'Your success has pleased us greatly', the correct answer is 'Your success has been a great pleasure for us.'