​When more than a few drops of blood are required to perform tests,a _______ collection of blood is performed.

A) ​capillary
B) needlestick
C) ​foot stick
D) ​venous

When a significant amount of blood is needed for testing, a venous collection is performed. This method involves drawing blood directly from a vein, typically using a needle and syringe or a vacutainer system, allowing for the collection of larger volumes of blood compared to capillary or other superficial methods.