This is a type of Conditional Sentence. The correct option will be, If I see Sarah, I'll tell her to call you.
<h3>What is a Conditional Sentence?</h3>
A conditional sentence is a type of sentence that states a condition and the outcome of that condition occurring.
Conditional sentences are made up of a dependent clause and an independent clause joined to express said condition. The if clause tells you the condition and the main clause tells you the result.
Learn more about Conditional sentences here,
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