During the Lacerta Vivipara Lizard Study, Researchers Monitored Individuals on a Daily

During the Lacerta vivipara lizard study, researchers monitored individuals on a daily basis to document the number of young produced by each female in the wild. What would be the best way to obtain the same type of data but not have to visit the site every day?

A) Try the study in an isolated population in the lab.
B) Install cameras on site to monitor lizard movement.
C) Capture animals twice per year and count them.
D) Capture animals and implant tracking devices.