I studied this before and I'm pretty sure it's D (sorry if I'm wrong)
Scientific advancement has increased food safety by the use of preservatives, refrigeration, better packaging, labels with expiration dates...that's a good many right there!
Answer:
It enters the atmosphere through both natural and human sources. Natural resources can be for instance volcanic eruptions, bacterial processes, evaporation from water, or decaying organisms. ... Sulfur dioxide may also react with water to produce sulfuric acid (H2SO4).
Explanation: