Heparin or LMW heparin is preferred for pregnant patients needing an anticoagulant because:

Select one:

a. its molecular size allows it to cross the placenta and thus help the offspring.

b. the offspring receives the full anticoagulant effect.

c. its molecular size does not allow it to cross the placenta to affect the offspring.

d. the offspring receives only a partial anticoagulant effect.