The website, which does not / accept advertisement and is funded / entirely by donations, describes itself / as the fifth most popular website on the planet.

The correct answer is: E. No error

The sentence is grammatically correct. The verb “describes” agrees with the subject “website.” The word “itself” is used correctly to refer to the website. The sentence is clear and easy to understand.

Here is a brief explanation of each option:

• Option A: The website, which does not accept advertisement and is funded entirely by donations, describes itself as the fifth most popular website on the planet. This option is the correct answer. The sentence is grammatically correct. The verb “describes” agrees with the subject “website.” The word “itself” is used correctly to refer to the website. The sentence is clear and easy to understand.
• Option B: The website, which does not accept advertisement and is funded entirely by donations, describe itself as the fifth most popular website on the planet. This option is incorrect. The verb “describe” must agree with the subject “website,” which is singular. The correct verb form is “describes.”
• Option C: The website, which does not accept advertisement and is funded entirely by donations, describes it as the fifth most popular website on the planet. This option is incorrect. The word “it” is used incorrectly to refer to the website. The correct word to use is “itself.”
• Option D: The website, which does not accept advertisement and is funded entirely by donations, describes himself as the fifth most popular website on the planet. This option is incorrect. The pronoun “himself” is used incorrectly to refer to the website. The correct pronoun to use is “itself.”
• Option E: No error. This option is the correct answer. The sentence is grammatically correct. The verb “describes” agrees with the subject “website.” The word “itself” is used correctly to refer to the website. The sentence is clear and easy to understand.