The correct answer is: D. no article
The reason is that “Liverpool University” is a proper noun, which is a noun that names a specific person, place, thing, or idea. Proper nouns are always capitalized and do not take an article.
Here are some examples of other proper nouns:
- The United States of America
- The Eiffel Tower
- The Atlantic Ocean
- The Mona Lisa
Note that there are some exceptions to this rule. For example, if you are referring to a general type of place, you would use an article. For example, you would say “I went to a university in England.” In this case, you are not referring to a specific university, but to any university in England.
I hope this helps!