Could someone answer the following question for me? What is

Could someone answer the following question for me? What is

Could someone answer the following question for me?
What is the current status of our search for inhabitable, Earth-like planets circling other stars? 
A). So far, we have found only high-mass planets similar to Jupiter or Neptune, but in 10 to 20 years we should be able to detect smaller, terrestrial planets.
B). We have found several Earth-like planets with oxygen-rich atmospheres, but have not yet confirmed whether the oxygen is biological or non-biological in origin.
C). We have found a few planets so far that are probably rocky, Earth-like planets, and more discoveries should soon follow.
D). We have detected almost 1000 low-mass planets similar to the Earth, although atmospheric oxygen (a sign of life) has not yet been detected.

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