Answer:
A. Microtubules.
Explanation:
Kinesin and dynein are motor proteins that are primarily associated with microtubules, which are one of the major components of the cytoskeleton. These motor proteins utilize ATP to move along microtubules and play essential roles in cellular transport and movement. Kinesin is involved in transporting cargo towards the plus end of microtubules, while dynein moves cargo towards the minus end.
