This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Reasons for preference of internal jugular vein over external jugular  vein for measurement of JVP include all except 
Select and explain. 
A. IJV is in direct continuation with right atrium, B. Increased sympathetic activity in IJV, C. EJV passes through more facial planes, D. Prominent valves at proximal portion of EJV
B: Increased sympathetic activity in IJV
Answer: B: Increased sympathetic activity in IJV 
Explanation: Increased sympathetic activity in EJV causes vasoconstriction of EJV , so pulsations become barely visible.