Why Is It Important to Not Confuse LMWH and Heparin

Why is it important to not confuse LMWH and heparin?

A) LMWH is more effective than heparin and therefore dosing is much different between LMWH and heparin.
B) LMWH is dosed less frequently than heparin and so confusing them could increase adverse effects.
C) Heparin has a higher bioavailability than LMWH and should therefore be dosed accordingly to reduce unwanted adverse effects.
D) LMWH are highly protein bound and should therefore not be confused.