Which of the following sentences correctly uses commas?

a.      Millions of viewers watch reality-based television shows. Cultural critics however, argue that shows such as The Amazing Race, Survivor and Jersey Shore exploit human greed and the desire for fame.

b.  Millions of viewers watch reality-based television shows. Cultural critics, however, argue that shows, such as The Amazing Race, Survivor and Jersey Shore exploit human greed and the desire for fame.

c.  Millions of viewers watch reality-based television shows. Cultural critics however argue that shows such as The Amazing Race, Survivor and Jersey Shore exploit human greed and the desire for fame.

d.   Millions of viewers watch reality-based television shows. Cultural critics, however argue that shows such as The Amazing Race, Survivor and Jersey Shore exploit human greed and the desire for fame.

I chooes B is it right?

A is incorrect.

B is the closest, but has an extra comma.
C and D are incorrect.

I say A

Of the following sentences, which is a (run-on sentence)?

I chooes C is it correct?
a. Carbon dioxide is, in turn, excreted by plants and it is produced by a variety of human activities, such as the burning of hydrocarbon fuels.

b. Along with carbon dioxide, water vapor and other waste products can accumulate in the atmosphere this creates a kind of barrier to the reflection of solar energy.

c . Some of the solar energy would otherwise bounce off the earth's surface and escape through the atmosphere.

d.  If enough carbon dioxide and other materials accumulate, scientists fear that our environment will become like a greenhouse.

Yes, you are correct. Option B is the correct sentence that uses commas appropriately.

Explanation: In this sentence, commas are used to set off additional information that is not essential to the main sentence. The phrase "however" is set off by commas to indicate that it presents an interruption or contrasting information. Similarly, the phrase "such as The Amazing Race, Survivor and Jersey Shore" is set off by commas to provide examples of the reality-based television shows mentioned earlier. These commas help to clarify the structure and meaning of the sentence.