As a load is mechanically lifted, the materials

a.
can weigh any amount without causing a problem with the equipment
b.
may strike workers if the load swings, twists or turns
c.
will not be affected by windy conditions or bad weather

The load may strike the workers if the load swings,twists or turns. this accident may due to windy conditions that may surprisingly catch workers by its movements. It also depends on what type of equipment was used in lifting the materials.

Malware, not sure what else would fit that description.

The answer would be d (tables)