The failure to detect planets with masses like that of the Earth indicates .
A) that Jovian planets are much more abundant in space than terrestrial planets
B) nothing about the existence of terrestrial planets around other stars because the techniques being used are unable to detect such planets
C) that planets like Earth all orbit their parent stars in the plane of the sky
D) that planets like ours do not exist around other stars

B) there's nothing about the existence of terrestrial planets around other stars because the techniques being used are unable to detect such planets

Explanation:

Since we've not been able to detect other earth-like planet, then it means that our current techniquesaee not able to detect them and so we can't describe their properties and behaviors.

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.