Explanation

Xylem is the vascular tissue that conducts water and dissolved minerals absorbed by the roots upward to the stems and leaves. This upward movement, driven largely by transpiration pull, carries the raw materials needed for photosynthesis. Food (photosynthates) is transported by a different tissue, the phloem, in both upward and downward directions. Gases move mainly through stomata and intercellular spaces, not xylem. Hence option B is correct.