We Are Not Yet Capable of Detecting Life on Planets

Multiple Choice

We are not yet capable of detecting life on planets around other stars.But as our technology develops,our first real chance of detecting such life will probably come from

A) sending spacecraft to study the planets up close.
B) examining spectral lines from the atmospheres of distant planets.
C) examining high-resolution images of the planets made by orbiting telescopes.
D) determining the orbital properties of the planets.