7. which one of the following statements is true regarding paragraphs? a. a paragraph should have one main topic. b. a paragraph with two main topics is called a complex paragraph. c. a topic sentence should not be placed in the middle of a paragraph. d. the topic of a paragraph is always placed in the first sentence.

the correct answer is:   [d]:

              →       " fond of fighting " .

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explanation:

the development of trade during the middle age increased to the change given in the agriculture, which gave money, industry and markets a bigger importance in economy. the agriculture production was more than the consumption, which meant the creation of wider markets out of the areas. besides, with the end of multiple wars, the population increased and new trade routes were created.