When the allocation of goods and services by a modern mixed economy is not efficient,
a) market powers can block beneficial gains.
b) monopolies can work to redistribute market equity.
c) governments may step in to resolve the market failure.
d) individuals of the markets can share equitable results.

The correct option is C.

When governments may step in to resolve the market failure, the allocation of goods and services by a modern mixed economy is not efficient.

Because they think that there assistance by putting legal maximum price that is price ceiling, and legal minimum price that is price floor, will be helpful but instead of this these prices just caused damage to individuals.

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.