Suppose We Observe the Two Exchange Rates $\times$ /US$ = 100, A$/US$ = 1

Suppose we observe the two exchange rates: $\times$ /US$ = 100, A$/US$ = 1.5. If the current cross-rate ( $\times$ /A$) between $\times$ and A$ is 50, which of the following is true?

A) The correct cross-rate ( $\times$ /A$) should be 33.33
B) It costs less to buy $\times$ with US$
C) An US$33.33 arbitrage profit can be realized
D) All of the above
E) None of above