Answer:
Utterson knew the house Mr. Hyde disappeared into belonged to his client Dr. Jekyll.
Explanation:
Robert Louis Stevenson's "The Strange Case of Dr. Jekyll and Mr. Hyde" revolves around the story of how a good doctor was dominated over by his alter-ego. In the end, the more dominant and dangerous personality took over the good doctor which led the latter to commit sui cide while he still has control over his sanity.
In the first chapter of the story, Enfield was telling Mr. Utterson about the horrendous incident he had encountered one late night. And in revealing how the 'monster' had compensated for his act of killing the young girl by giving a cheque, Utterson did not ask for the name on the cheque. This was because he had already known the owner of the house where Mr. Hyde, the child killer, had gone in to get the money and cheque.
Thus, the correct answer is the third option.