Answer: C. a positive externality.
Explanation:
The positive externality refers to actions that directly or indirectly present benefits to society. Sometimes these activities are paid for third parties, likewise, it can be seen that each action that is carried out, however small, will have effects on people (society) causing a positive externality.
For example, in the case of the neighbor, there is a positive externality, since his ability with the garden gives the neighborhood a nice touch, although some plants are not liked by some neighbors, you can see different and beautiful things in the neighbor's garden, and this benefit is being obtained at no cost to others since the person who invests is a person and the others also enjoy the benefits of it.
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Answer:
d. 12.72%
Explanation:
To calculate the expected return on the market, we will use the Capital asset pricing model (CAPM) equation.
The CAPM allows to relate the risk-free rate of return (RFROR), the market risk premium, the beta of an asset and the expected return of this asset.
Expected return = risk-free ROR + (Beta*Market risk premium)
In this case we know all the parameters but the Market risk premium (MRP), so we have:

We also know that the beta of the market, by definition, is equal to one. So now that we know the market risl premium we can calculate the expected return on the market:

The expected return on the market is 12.72%.
There all good but if you want answer I will go with service because without service how are you going to learn if your tutor is not there
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Answer:
Tariff
Explanation:
A Tariff is otherwise known as an import duties, it is the taxes imposed on goods that come from other countries into a particular country. Tariff is imposed for so many reasons one of which is to protect local industries of the country i.e enabling local industries in the country to have profitability in their business and eliminating competitions from foreign organisation.
By imposing tariff, the rate of goods imported into a country will be reduced and this will encourage local production of goods and discourage importation.
B: Complicated I think that it this one I may be wrong -if I am sorry