Why Would a Researcher Be Slow,careful,and Meticulous While Vacuuming a Specific

Why would a researcher be slow,careful,and meticulous while vacuuming a specific part of a deep-sea chimney?

A) to avoid cross contamination of biological species
B) to avoid breaking the chimney
C) to document a specific environmental habitat
D) because it is done remotely and requires skill
E) All of the above.