Final answer:
Hepatitis C is the bloodborne pathogen most easily passed through sharing a razor due to its high transmissibility via blood-to-blood contact.
Step-by-step explanation:
The bloodborne pathogen most easily passed through sharing a razor is Hepatitis C (C).
Hepatitis B, HIV, and syphilis can also be transmitted through blood, but Hepatitis C is particularly known for its high transmissibility via blood-to-blood contact. Sharing razors can lead to exposure to tiny amounts of blood, making the transmission of Hepatitis C more likely compared to the other pathogens.
Hepatitis B is also easily transmitted through blood; however, it is mostly associated with healthcare settings and has a vaccine that can prevent infection. HIV has a lower transmission risk through razor sharing as it requires a larger volume of blood to transmit. Lastly, syphilis, primarily transmitted through direct contact with syphilitic sores, is less commonly spread by sharing razors.