The correct option is A The Story of Denim Jeans
The given passage is based on how denim jeans came into existence. It begins with a miner's wife who wanted to get pants sewn for her husband such that they wouldn't tear easily. These denim jeans became highly popular because they were long lasting. Soon it became a global trend.
Hence, the most suitable title lies in option A: The Story of Denim Jeans, because the passage tells a story of how jeans came about.
Hence A is correct.
The rest of the options concentrate on a single aspect: eternally young jeans (the cloth would always remain eternally young), American Levi's for the world (due to the global popularity) and riveted pants (they were called so before they became so popular). But, they are not suitable for the passage as a whole. Hence options B, C and D are incorrect.