Which artery primarily supplies the gallbladder?

The cystic artery is the primary blood supply to the gallbladder, making it the correct answer. The cystic artery typically arises from the right hepatic artery and specifically serves to provide oxygenated blood to the gallbladder itself. This artery plays a crucial role in supplying the tissue and is essential for the organ's function in storing and concentrating bile.

In the context of the other options, the left gastric artery primarily supplies blood to the lesser curvature of the stomach, while the right hepatic artery supplies the liver and not directly the gallbladder. The splenic artery serves the spleen and parts of the pancreas, thus having no direct role in supplying the gallbladder. Understanding these anatomical relations helps clarify the significance of the cystic artery's role in gallbladder vascularization.