Why should you cover your cargo?

All of the above.. Section 3.3: Covering cargo serves three purposes: protecting people from spills, protecting cargo from weather, and

ANSWER BREAKDOWN

A. Incorrect. "To protect people from spilled cargo." is not correct. Covering cargo serves three purposes: protecting people from spills, protecting cargo from weather, and potentially helping with fuel economy (though safety is primary).
B. Incorrect. "To protect the cargo from weather." is not correct. Covering cargo serves three purposes: protecting people from spills, protecting cargo from weather, and potentially helping with fuel economy (though safety is primary).
C. Incorrect. "To improve fuel economy (aerodynamics)." is not correct. Covering cargo serves three purposes: protecting people from spills, protecting cargo from weather, and potentially helping with fuel economy (though safety is primary).
D. Correct. Covering cargo serves three purposes: protecting people from spills, protecting cargo from weather, and potentially helping with fuel economy (though safety is primary).

Por que debe cubrir su carga?

ATo protect people from spilled cargo.

BTo protect the cargo from weather.

CTo improve fuel economy (aerodynamics).

DTodas las anteriores.