Which of the Following Is a True Statement

Multiple Choice

Which of the following is a true statement?

A) While researchers found it difficult to reject the random walk hypothesis for exchange rates on empirical grounds,there is no theoretical reason why exchange rates should follow a pure random walk.
B) While researchers found it easy to reject the random walk hypothesis for exchange rates on empirical grounds,there are strong theoretical reasons why exchange rates should follow a pure random walk.
C) While researchers found it difficult to reject the random walk hypothesis for exchange rates on empirical grounds,there are compelling theoretical reasons why exchange rates should follow a pure random walk.
D) none of the options