Which of the following are homologous?

The vertebrate brains are homologous. They develop from the neural tube and have a similar fundamental structural plan (forebrain, midbrain and hindbrain).

The eye of the octopus and of man are analogous. 

The tendrils of Cucurbita and those of Pisum are analogous. The tendrils of Cucurbita are stem tendrils which develop from axillary buds while those of Pisum are leaf tendrils.

Sweet potato (root modification) and potato (stem modification) are analogous.