You observe the price of a good rises and the quantity sold decreases. This is the result of

This is the result of law of demand and elasticity of demand

Explanation:

The law of demand states that, other things remaining equal, the higher the price of a commodity, the lower the quantity demand of that commodity. Also, the observed goods in the question is a normal good because all normal goods obey the law of demand.

In addition, the price elasticity of demand is ELASTIC. This means the good is sensitive to price. A 1% increase in price will lead to a significant decrease in quantity demanded.

Also the income elasticity of demand is negative, meaning an increase income means the quantity demanded will decrease. This usually happens for inferior goods.

All these three points can cause it

the correct answer option is b. a single paragraph.

explanation:

when you are thinking about paragraph​ topics, you should always choose a subject that can be adequately addressed in a single paragraph.

a paragraph is a piece of writing consisting of a few sentences that deal with a single theme. it has only a single idea that the paragraph revolves around and talks about.

so a paragraph topic must be chosen wisely where a single idea can be communicated in a single paragraph.