Answer: When the mind is unbiased
Explanation: Making rational decisions requires one to be unbiased either as a result of religious, racial or gender influence. It also requires one to be in the right frame of mind at the time of making the decision. Emotional decisions could occur if one's judgment is influenced by religious, cultural or social inclination or sympathy towards a particular group. It could also stem from one's present state of mind at the time the judgment is passed, hence making one's judgment more of emotional than rational.
In other to make rational decisions one should be in the right frame of mind, free from external influences which could induce bias into one's decision.
The speech was for teacher's day
answer One advantage a secondary source may have over a primary source is that the person creating the secondary source has access to a variety of primary sources. This means that a variety of viewpoints can be included in the secondary source.
The answer to this question is B. Elevators
One of the reason why skyscrapers were not popular before the invention of elevators was that it took too much energy to move from the groud floor to the upper floor with the stairs alone.
After the invention of elevators, we eliminate this problem and people could move from ground floor to upper floor with only little effort.