Final answer:
The LPN/LVN recapping a needle after use requires further education because this practice can lead to needlestick injuries and bloodborne pathogen transmission.
Step-by-step explanation:
The observation made by the charge nurse that requires the LPN/LVN to receive further education is A. The LPN/LVN recaps a needle after injecting a client. This practice is not recommended because it poses a risk of needlestick injury, which can lead to the transmission of bloodborne pathogens. The preferred practices are reflected in options B and D, wherein the LPN/LVN places the safety lock on the needle after use and disposes of the syringe and needle in the sharps container, respectively. Additionally, hand hygiene, as described in option C, is a critical practice in preventing the transmission of infectious diseases.