The correct option is A Examining stool for Ascaris eggs
About two months after ingestion of the ascariasis eggs, the worms matures in the intestine and they live, laying thousands of eggs a day in the intestine. Thus, they can be found in the stool. To diagnose ascariasis, the stool is examined for microscopic eggs and larvae. But eggs won't appear in stool until at least 40 days after one is infected.