Tracheids, vessel elements, sieve-tube cells, and companion cells are components of
vascular tissue
meristematic tissue
ground tissue
dermal tissue

The correct answer is A. Vascular tissue

Explanation:

The vascular tissue refers to different cell types that form conduction structures in vascular plants and whose main function is to transport substances such as nutrients, water, and minerals that support functions in the plant including photosynthesis. The two main structures that are part of this are the xylem that transports from elements from the roots to the leaves and the phloem that transport substances from leaves to the roots. Additionally, the xylem is composed of cells called tracheids, vessel elements and the phloem is composed of sieve-tube cells and companion cells. Therefore, tracheids, vessel elements, etc are components of the Vascular tissue.

a. the production of carbon dioxide through the process of photosynthesis