B is probably the best choice for this question.Hope I helped.
The correct answer is : a. 1 to 1.5
Replenishing Glycogen stores over period of time is very important to keep your focus through out the day and prevent mood swing. But you should be careful in measuring your carbs intake. Consuming carbs More than that required measurement could risk your exposure to Unhealthy weight gain or diabetes
Sara is dehydrated because she sweats and the water is distributed faster.
Jeff is Dehydrated because he is losing the stuff in his stomach