Final answer:
Not using safety caps on centrifuge buckets has the highest potential for aerosol exposure.
Step-by-step explanation:
The highest potential for aerosol exposure among the options listed is Not using safety caps on centrifuge buckets. When the safety caps are not used, there is a risk of aerosols being generated during the centrifugation process. These aerosols can contain potential contaminants and can pose a risk to the individuals in the lab.