Which of the following circumstances would prohibit a radio telescope from detecting a star?
a. cloud filled night sky
b. daytime
c. no visible light radiated
d. no radio waves radiated

 The correct answer is :  D. no radio waves radiated

Explanation:   The radio telescope works by picking up radio waves that are emitted by radio sources. In order to receive quality signals it is necessary to use antennas or groups of smaller antennas organized in parallel. Several stars emit radio waves and not visible light.

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.