Final answer:
Physical access control is the most suitable security control for preventing laptop theft in an organization's offices, as it restricts the physical access to the assets.
Step-by-step explanation:
The security control that Druna, a security practitioner, would probably find most effective for preventing the theft of laptops from an organization's offices is B) Physical access control. This type of security control restricts access to the organization’s assets and can be implemented in various forms, such as security guards, locked doors with badge access systems, cable locks for laptops, or secure storage when they’re not in use. While other security controls like encryption (A) Encryption), intrusion detection systems (C) Intrusion Detection System), and firewalls (D) Firewalls) are essential for protecting data and networks, these measures do not specifically prevent the physical theft of devices.