Which of the following is true of volume and open interest?

Which of the following is true of volume and open interest?
A . Volume precedes price
B . On-balance volume is not as accurate measure of volume as basic volume column charts
C . Within an uptrend, a sudden leveling off or decline in open interest often signals that the current trend will accelerate
D . Decreases in volume and open interest help confirm the resolution of price patterns

Answer: A