Answer :
The right answer for the question that is being asked and shown above is that: "order of importance." The pattern of type that this paragraph has is that of order of importance. It started with a main topic and then followed by the supporting details of the main topic.
The pattern type this paragraph uses is cause and effect.
Explanation: The paragraph type is cause and effect because it discusses the causes and effects of a situation. In the beginning, it states that "the art of letter writing seems to have declined sharply in recent years" and lists the probable causes of the letter decline.