I'm not 100% sure but I think it is A. Sorry if it is wrong.
I would say A for question 4
That car is more expensive than mine. Thus, the correct option is B.
<h3>What is the Degree of Adjectives?</h3>
The degree of adjectives may be defined as one of the three forms used in the qualitative comparison of adjectives to express the identity of any noun or pronoun.
The sentence is in a comparative layout and the word 'than' is used to compare the things, so the answer is more expensive.
Therefore, it is well described above.
To learn more about the Degree of adjectives, refer to the link:
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Observing human judgement when responding to price is almost inverse to Economic's Law of Supply and Demand. If the price is relatively lower, people will tend to buy more items or in bulk. If it is more expensive, lesser quantity will be purchased. For the Law Supply and Demand, the independent or affecting factor is the demand or the quantity of goods and services purchased. The demands sets the market price of goods or services. The higher the demand, the higher the demand, the higher the market price is.