the application of techniques like mass production Let's look at the available options and see what makes sense. the use of heat and open fires for cooking - This sounds like the discovery of fire and as such it happened a long time before the nineteenth century. Wrong answer. the application of techniques like mass production - This one looks promising. We'll take if the other 3 options are just plain silly. the introduction of earthenware such as clay vessels - This is more recent than the discovery of fire. But it's still a long time ago. Literally thousands of years BC. So wrong answer. the discovery of the technique of roasting raw foods - Another discovery that happened thousands of years ago. So also the wrong answer. So of the 4 choices, 3 of them happened literally thousands of years ago and so well before the nineteenth century. That leaves only 1 viable choices, so the answer is "the application of techniques like mass production"

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3 years ago