Answer:
The Answer is A.Crude oil
Polygyny has several economic, social, and health advantages over monogamy. In most cultures, women contribute significantly to the wealth of the household and can thus materially benefit from the labour of an additional spouse.
Feudalism was a set of legal and military customs in medieval Europe that flourished between the 9th and 15th centuries. It can be broadly defined as a system for structuring society around relationships derived from the holding of land, known as a fiefdom or fief, in exchange for service or labor.
B. Classical conditioning produces permanent learning
