Identify the use of the introductory comma in the sentence. when the president arrived in town, the people cheered him from the airport to his hotel. participial phrase adverb clause interjection

answer; i believe that the correct answer is (scientific data);

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.