The fundus of the stomach is located relative to the left lobe as:

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The fundus is the dome-shaped, superior part of the stomach that sits under the left hemidiaphragm and behind the stomach’s other portions. The left lobe of the liver lies anterior (in front of) and somewhat medial to the stomach. Because the liver sits over the stomach, the fundus ends up behind (posterior to) the left lobe and toward the left side (lateral). That makes the correct relationship posterior and lateral.

In contrast, describing it as anterior would imply the fundus is in front of the liver, which isn’t the case, and other options misplace it in relation to the liver’s position or vertical axis.