The best option from this list is "<span>economic planning", since this is done in communist societies, and during this time the US was very anti-communist and in a Cold War with Russia. </span>
Exchanges<span> of plants, animals, diseases and technology transformed </span>European and Native American ways of life. Beginning after Columbus' discovery in 1492 the exchange<span> lasted throughout the years of expansion and discovery. The </span>Columbian Exchange<span> impacted the social and cultural makeup of both sides of the Atlantic.</span>
The second alternative is response (B).
Human relationships are complex, and can be affected positively or negatively through various forms and feelings.
One of the possibilities in which one can perceive the wear and tear of a relationship is when a feeling of anger arises, however, this is not the only form. The first sign of a relationship problem may have other motives like jealousy, lies or behavior change.