Final answer:
Betty should use a wide-angle lens to capture the entire Empire State Building from the foot of the building.
Step-by-step explanation:
Betty should use a wide-angle lens to take a picture of the Empire State Building from its foot while keeping the entire building in focus and within a single plane. A wide-angle lens has a shorter focal length, which allows for a wider field of view to capture large subjects, such as tall buildings, within the confines of a single photograph. Using a wide-angle lens is essential in architectural photography when one needs to capture the entirety of a structure from a close distance without needing to step back to fit the subject in the frame.