When many plants grow in a crowded space where resources may not be sufficient to support all of them, some plants may die from a lack of sunlight, water, or nutrients.
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Competition
Mutualism
Predation
Parasitism

Competition

Explanation:

The plants are competing against each other for the resources they need for survival. The other three answers involve different plants interacting with each other and the question does not mention interactions between them, meaning it's basically referring to survival of the fittest.

i think that c)gold was found there

but i am not sure