Final answer:
The best method for Rob to roast marshmallows is by using a campfire, as it provides the appropriate heat and classic outdoor experience for roasting marshmallows to a golden brown.
Step-by-step explanation:
The best way for Rob to produce the heat energy needed to roast marshmallows while camping with his family would be option 2) Using a campfire. A campfire is an example of basic thermochemistry that involves the reaction initiated by heat from a match, converting wood to carbon dioxide and water, and releasing heat energy that can be utilized for roasting marshmallows.
Roasting marshmallows is a beloved activity, where the goal is to achieve a nice golden brown exterior without it catching on fire. This heat energy from a campfire is perfect for roasting because it will evenly cook the marshmallow, unlike a microwave or flashlight which are not suitable for roasting, and a gas stove that might not provide the traditional camping experience and flavor.
Additionally, replicating the thrill of roasting marshmallows over a campfire cannot be matched by these other methods. The campfire provides the right temperature and the classic ambiance for making s'mores and enjoying the company of family and friends in an outdoor setting.