A nurse is caring for a client who is diagnosed with a deep vein thrombosis (DVT) and is receiving heparin. The client asks the nurse how long it will take for the heparin to dissolve the clot. Which of the following responses should the nurse give?

A. PT/INR is not the appropriate measure for heparin therapy, as heparin is monitored using activated partial thromboplastin time (aPTT). This response could mislead the client regarding treatment expectations. B. While it may take time to reach therapeutic levels, this statement doesn't clarify that heparin is not a clot-dissolving agent. C. Heparin prevents the extension of existing clots and the formation of new clots but does not actively dissolve clots already present. D. This statement incorrectly suggests that immediate effects are seen, which is not the case as heparin's action involves prevention rather than dissolution.