The correct option is Habrá erosión en las playas si no protegemos los arrecifes de coral.
What is the statement about?
Habrá erosión en las playas si no protegemos los arrecifes de coral in english means There will be erosion on the beaches if we do not protect the coral reefs.
Note that the statement is said to be in motion as it tells that an event will occur and such the word Habrá is best fit for the sentence above.
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