Carrying cargo is prohibited if it restricts the field of vision, makes control harder or covers the lights.
Under the traffic rules, carrying cargo is prohibited if it restricts the driver's field of vision, makes control harder, reduces stability, covers the lighting devices, number plates and identification signs, or obstructs the perception of hand signals (clause 164). Since all the listed conditions break these requirements, the option that includes all the cases is correct.
Option 1. This option names only one part of the rule, while all the listed conditions prohibit carrying the cargo.
Option 2. This describes only one specific danger and ignores the other, equally important prohibitions.
Option 3. This covers only the visibility of the vehicle's signals and ignores the driver's field of vision and stability.