Photosynthesis occurs in organisms that contain chlorophyll and can convert light energy into chemical energy. Among the options provided, grass and tree trunks (specifically the leaves of trees) are capable of photosynthesis because they contain chlorophyll.
Honeybees and frogs do not perform photosynthesis; they rely on consuming other organisms for energy. So, the correct answers are grass and, indirectly through their leaves, tree trunks.