Final answer:
The advantage of using heparinized samples is that both hematologic and chemistry data can be obtained from a single green-top tube, preserving blood morphology for a range of tests without improved staining of blood smears.
Step-by-step explanation:
An advantage to using heparinized samples is that both hematologic and chemistry data can be obtained from a single green-top tube. This is because heparin acts as an anticoagulant, thus preserving the blood morphology and allowing for a variety of tests to be conducted including complete blood counts and blood chemistries without the need for multiple samples.
The advantage of using heparin is not typically associated with improved staining quality of blood smears, hence not improving the cellular morphology discernible in such tests. Therefore, amongst the given options, both A and B are not correct, and the best choice is option 3) Both hematologic and chemistry data can be obtained from a single green-top tube.