Which of the following sentences contains the correct capitalization and punctuation?

A) After applying for the job and sitting through eight interviews the applicant was relieved to finally be offered the position.
B) Running a twenty-six mile marathon is a huge undertaking it requires a lot of training and mental toughness.
C) Car companies are under immense pressure from the government to abide by EPA clean air standards; therefore, companies try to cheat the system to keep profits up.
D) Lawn maintenance requires time dedication and hard work, that explains why I hire someone else do take care of my yard!

C) Car companies are under immense pressure from the government to abide by EPA clean air standards; therefore, companies try to cheat the system to keep profits up.

Explanation:

Analyzing

A) After applying for the job and sitting through eight interviews the applicant was relieved to finally be offered the position. : There are no punctuations like comma, and semi-colon in appropriate places. It makes the sentence difficult to read.

B) Running a twenty-six mile marathon is a huge undertaking it requires a lot of training and mental toughness. : A full-stop after the word 'undertaking' is missing.

C) Car companies are under immense pressure from the government to abide by EPA clean air standards; therefore, companies try to cheat the system to keep profits up. : No fault in the sentence.

D) Lawn maintenance requires time dedication and hard work, that explains why I hire someone else do take care of my yard! : Inappropriate use of exclamation mark and comma in the sentence.