Which of the following are intraperitoneal organs?

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Intraperitoneal organs are those completely enveloped by peritoneum and suspended inside the peritoneal cavity by mesenteries. The stomach and the liver fit this description: the stomach is covered by peritoneum on both sides and is tethered to the abdominal wall via the greater and lesser omenta, making it mobile within the cavity. The liver lies within the peritoneal cavity as well and is connected to the diaphragm and anterior abdominal wall by peritoneal ligaments (such as the falciform and coronary ligaments), with most of its surface covered by visceral peritoneum.

In contrast, the pancreas is mostly retroperitoneal, sitting behind the peritoneum with only a limited association to peritoneal structures, and the kidneys are fixed to the posterior abdominal wall, also retroperitoneal. So the combination that represents intraperitoneal organs is the stomach and liver.