Correct option is B
Femoral vein is one of the standard access sites for central venous catheterization, especially in emergencies. It provides a direct path to central circulation, and is easy to access, especially in supine or trauma patients.
Explanation of each option: • (a) Radial vein – Not used for central venous access; it's a superficial and small peripheral vein, typically used for IV cannulation or arterial lines (in the case of radial artery). • (b) Femoral vein – Correct. A large, deep vein located in the groin, commonly used for central venous catheter placement, especially when upper body access isn’t feasible. • (c) Basilic vein – A peripheral vein in the arm; may be used for peripherally inserted central catheters (PICC) but not for direct central line access. • (d) Cephalic vein – Another peripheral vein; used for IVs or PICC, not for central catheter insertion.