I need some explanation for these questions. Thanks

56. The era in marketing history characterized by the notion that a good product will sell itself is known as the A) production B) sales C) marketing D) relationship 57. Amelia is sitting at her computer, analyzing the financial impact of an increase in her company's sales growth rate. Amelia is probably using a A) spreadsheet B) presentation C) word processor D) desktop publishing program 58. Presentstion - Why did Blockbuster fai? a. It was a bad idea for business b. It was a poor business model under the company Viacom c. It failed to adapt to changing market trends d. It capped late fees at $10. 59. Coke, Diet Coke, Cherry Coke, Coke Zero, and Coke with Lime constitute Coca Cola's A) B) C) D) of soft drinks product mix product life cycle product cluster product line 60. Which of the following is inconsistent with a product in its decline stage? A) B) C) D) Producers are beginning to leave the industry Prices begin to decline sharply. Few changes occur in the product features Promotion activities are kept to a minimum 61. A convenience store offers utility by being open 24 hours each day. A) place B) form C) time D) ownership