Final answer:
The behavior that indicates that Eugena understands the instructions related to her new medication is demonstrating the correct administration of the medication.
Step-by-step explanation:
The behavior that indicates to the nurse that Eugena understands the instructions related to her new medication is C) Demonstrating the correct administration of the medication.
If Eugena is able to correctly administer the medication, it shows that she understands the instructions regarding the medication, including the dosage, frequency, and method of administration. This behavior demonstrates her comprehension and ability to follow the instructions accurately.
For example, if Eugena was instructed to take the medication orally and she demonstrates this by swallowing the pill instead of applying it topically or injecting it, it would indicate her understanding of the correct administration.