What is the passage about microplastics mainly about?
Read the passage: Microplastics are pieces of plastic smaller than five millimetres across. Some are made deliberately small, but most form when larger items such as bottles and bags break into fragments under sunlight and waves. Washing clothes made from synthetic fabrics releases tiny fibres, and car tyres shed particles as they wear down on roads. Rain and rivers carry these particles into the sea. Scientists have now found microplastics almost everywhere they have looked, from deep ocean trenches to Arctic sea ice. Small sea creatures often mistake them for food, and the particles can pass up the food chain. Researchers are still studying what effects this may have on wildlife and on the people who eat seafood.
Correct answer D. Where tiny plastic particles come from and how widely they have spread
The passage describes the sources of microplastics and how they have reached almost everywhere, while noting that their effects are still being studied, so option A states its focus.
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