What does LNAV/VNAV provide during an approach?

LNAV/VNAV, short for Lateral Navigation and Vertical Navigation, is designed to provide both lateral and vertical guidance to pilots during an approach. This dual guidance system enhances the precision of the approach, allowing for better alignment with the runway both horizontally and vertically.

Lateral guidance ensures that the aircraft follows a defined horizontal path to the runway, while vertical guidance gives the pilot information about the proper descent profile to maintain, enabling a more controlled and accurate descent. This is particularly beneficial during approaches where maintaining specific altitude and alignment is critical for safety and efficiency.

Understanding this function is crucial for pilots as it supports them in managing approaches under instrument flight rules (IFR), particularly in conditions where visibility may be limited. Therefore, LNAV/VNAV significantly contributes to safer landings by combining both aspects of approach navigation, making B the correct answer.