Answer: (C.) Becca is the one who has asthma.
Explanation: The person in the family that has asthma is one of the kids: Becca.<u> What indicates that Becca is the person with asthma is the clause "Tara is busy making sure that Becca has her asthma inhaler"</u>. In other words, the mother, Tara, is checking that her daughter is taking <u>her asthma inhaler, the device holding a medicine for a asthmatic person</u>, to the beach. Therefore, the correct answer is C.
No the answer is D) and I know this for a fact. Do not listen to the person who said the answer is C)