Which of the following should Anisha NOT use to prepare her meals using energy-efficient systems and appliances?

A slow cooker is not typically seen as the most energy-efficient option when preparing meals compared to other choices. While slow cookers can be convenient and great for certain recipes, they generally use energy continuously for several hours, making them less efficient for quick meal preparation.

In contrast, a pressure cooker utilizes steam and high pressure to cook food significantly faster than conventional methods, thus saving energy in the process. Microwave ovens are renowned for their energy efficiency, as they directly heat food rather than the surrounding air, which minimizes energy loss. Convection ovens enhance cooking efficiency by circulating hot air, allowing food to cook evenly and often reducing cooking times and temperatures compared to traditional ovens.

Therefore, when considering energy-efficient cooking methods, the slow cooker is the least favorable choice among the options given.