Tara and Gabby would not be able to sue Kelly for breach of contract if the court determines that 10 minutes less is not a material breach and Kelly acted in good faith.
Kelly did not break the contract on purpose and instead acted in good faith based on what they perceived the time to be.
The 10 minutes that was denied Tara and Gabby were also not very significant and so might not warrant a material breach. If the court finds these two things to be the case then there is no breach of contract.
In conclusion, option A is correct.
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