When you get to the airport, your luggage will have to be ________. ?

The correct answer to the sentence "When you get to the airport, your luggage will have to be ________." is D) weighed. When flying, airlines have specific weight limits for baggage to ensure safety and efficiency during air travel. Passengers are required to place their luggage on a scale so that the weight can be measured. This process is essential for several reasons: it helps determine any applicable fees for excess baggage, ensures that the aircraft is not overloaded, and facilitates proper distribution of weight within the airplane for optimal performance.

The other options, while they may involve measurement or assessment, do not fit the context of airline operations as effectively as "weighed." For example, "reckoned" generally refers to calculating a number or accounting for something, "balanced" implies making equal or finding equilibrium, and "scaled" suggests a measuring process but is less commonly associated directly with luggage handling.

In summary, since weighing luggage is a standard and necessary procedure at airports to comply with airline policies, it is the most appropriate and contextually accurate choice.