The answer is B because A, C and D have grammar errors
The answer is C.<span>present perfect</span>
use this as a guide
A mixed economy is an economic system that combines aspects of the market, command, and conventional economic systems. A mixed economy is the most widespread economic structure in existence.
<h3>What is an economic system?</h3>
A country's or a region's social structures can organize and distribute the resources, services, and goods that are accessible through the use of an economic system. Land, capital, labor, and physical resources are all governed by economic systems.
A society's or a specific geographic area's system for producing products and services, allocating resources, and distributing them is known as an economic system or economic order.
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Answer:
In any written text, the author must build interactions between ideas to engage the reader. One common strategy writers use to develop ideas in their writing is through elaboration, which is the process of progressively going into more detail sentence by sentence throughout the text.
