I want to know the answer to the following question:
Who helped save the Ottomans by signing a convention in London?
All the background I'm provided with is that "The Ottoman Empire was saved by Great Britain, Austria, Prussia and Russia by signing a convention in London in July 15, 1840 to grant Muhammad Ali and his descendants the right to inherit power in Egypt in exchange for removal of Egyptian military forces from Syria and Lebanon.". Is that enough to answer the question?
Answer: yes