ETF qn from Mock investment, provide, likely, credit, result

toocfatoo

Exchange Traded Funds (ETFs) are affected by trading risk, which is most likely
to:
A. expose investors to counterparty credit risk.
B. result in prices that differ from Net Asset Value ( NAV).
C. provide investment results that do not correspond to the price and yield
performance of their respective indexes.

Answer B
Why not C? Are'nt B and C almost same?

draz

Over the longer term, price imbalances will be corrected by the firms that issue/buyback units of the ETF