Final answer:
The volume of 1/4 cup of isopropyl alcohol is exactly as stated, 1/4 cup. There's no need for further calculation, hence the answer is C. 1/4 cup.
Step-by-step explanation:
The volume of 1/4 cups of isopropyl alcohol is simply the amount being referred to, as the question is asking what the volume is of a certain fraction of a cup. Since the student has specified 1/4 cups, that itself is the volume. There is no calculation required to determine a different amount.
Therefore, the correct answer is C. 1/4 cup. The volume of 1/4 cup of isopropyl alcohol is exactly as stated, 1/4 cup. There's no need for further calculation, hence the answer is C. 1/4 cup.