Deniz and Mert are planning a 3-day trekking adventure in the Kaçkar Mountains this summer. Deniz says, "We must always put safety first." Mert lists four precautions. According to the safety principle, which of the following precautions is NOT a safety measure but a preference for comfort or convenience?
A)Carrying exactly 2 kilograms of chocolate for extra energy
B)Starting the daily route at 6 a.m. to finish before the fog descends
C)Wearing a different colored T-shirt each day to take better photos
D)Camping only at altitudes below 2500 meters to save tent weight