tan A should be the corner try work out work out:

first and then add all the others (B=90)
Explanation:
A and C should be the same
Specialization refers to a method of production whereby the
producer concentrates on producing limited goods in order to achieve high
levels of efficiency and productivity. An example is producing clothes because of
the existence of the raw materials and technology to produce them efficiently.
The buyer gains in terms of low prices
C ruler does not have more control than their citizen
He tried to increase US oil production
The term biased best describes the article.
Option: C
Explanation:
Bias refers to the either in favor or in against of a situation. Here once Robert insulted his political opponents and stated the difficulties what he has faced during his working period with them. Again he talked with the member of the political party in the off side. This situation depicts the bias condition of a person means he is playing dual role or progressing diplomatically.
Accurate statement is when it states the fact in a very straight forward way and supportive means take the side of one party and speak in favor of f them. Humorous means represent the thing for promoting amusement.