The tiny invaders being discussed in the article are plants. They are considered invaders because they came from other countries, but are now threatening the native plants. People brought them in because they wanted to make their gardens and yards beautiful because the plants are very rarely found locally.
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ANSWER
Option C is the correct answer
Agriculture developed at a sudden / sharp rate, due to the pressure of hunter societies needing to quickly find a new food source, either because the original prey went extinct or because the prey decided to evolve and move to a different location.