Which of these is an example of a labor law?
a. a limitation on building types in an industrial area.
b. a regulation against production limitation.
c. a requirement that products be truthfully labeled.
d. a restriction on when a union may call a strike.

D. A restriction on when a union may call a strike.

Explanation:

A labor law is concerned with the establishment of labor relation framework that provides peaceful relations between the employees and the organization. It usually includes the rules for forming a union. In this condition the union of labor or workers become a bargaining agent and conducts strikes and lock-outs to fulfill it's needs and present their grievances to the authorities.

The answer is D. A restriction on when a union may call a strike.

Explanation:

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .