When We Are Lucky Enough to See an Extrasolar Planet

Multiple Choice

When we are lucky enough to see an extrasolar planet transit its star:

A) it will cause the star to vanish for several hours.
B) we can find the planet's size, mass, and density by the drop in light.
C) we can determine what elements are in its atmosphere.
D) we can determine its shape.
E) we can be certain it is a terrestrial, not a jovian.