What is required by law to be carried in a vehicle driven in Iowa?

In Iowa, it is mandated by law for all drivers to carry a valid driver's license while operating a vehicle. This ensures that the driver has met the necessary requirements to legally drive, including passing the necessary tests and maintaining good standing. Additionally, proof of insurance is also required to ensure that drivers can cover any liabilities that may arise in the event of an accident. This legal requirement helps protect both the driver and other parties involved on the road, promoting responsibility and accountability.

The options referring to a spare tire, a first aid kit, or a flashlight might be useful items to have in a vehicle for emergencies, but they are not legally required by Iowa law to be carried in the vehicle. Therefore, the only correct choice that meets legal obligations for driving in Iowa is the requirement of possessing a valid driver's license and proof of insurance.