Final answer:
A deficiency in vitamin C can lead to fragile blood vessels that are prone to 'blow' when starting an IV, due to its role in collagen formation which maintains the strength and integrity of the vessels.
Step-by-step explanation:
The condition where veins 'blow', puffing up and leaking blood into the subcutaneous tissue after an IV attempt, can sometimes be associated with the fragility of blood vessels.
One possible cause for this could be a deficiency in vitamin C, as it plays a crucial role in the formation of collagen, which is important for maintaining the integrity and strength of blood vessel walls.
A deficiency in vitamin C can lead to scurvy, which is characterized by symptoms such as fragile capillaries, delayed wound healing, and a tendency to hemorrhage. Therefore, the correct answer is 3) C, indicating a deficiency in vitamin C.