Final answer:
The primary outcome of colocalizing quantum dots by motor proteins on microtubule arrays is their orderly alignment along the microtubule tracks.
Step-by-step explanation:
The primary outcome of the colocalization process involving quantum dots and motor proteins on polarized microtubule arrays is C) Alignment on microtubule arrays.
This process leverages the unidirectional movement of motor proteins like dynein and kinesin along the microtubule tracks, transporting their cargo, which includes quantum dots in this context, to specific locations within the cell.
This directed transport and the subsequent colocalization do not relate to altering the size of quantum dots, enhance the motor protein activity directly, or lead to quantum dot degradation but instead achieves orderly alignment against the polarized microtubule array.