A) Some people are against capitalizing the word 'Capital', but it is indeed referring to the Capital of Australia. Although, the other people use it as: 'capital of Australia.' This time, I'm saying no to this sentence.
B) This sentence is capitalized correctly. February in the sentence is spelled wrong, but we're talking about capitalization here. The Alps is also capitalized correctly since it is the name of a mountain.
C) This sentence is capitalized correctly. April is a month so it should be capitalized, and as for Germany since it is a country.
D) This sentence is painfully wrong. 'Catholics' should be capitalized, and so should 'Virgin Mary'. Wrong.
E) This sentence is wrong as well. 'The Treaty of Versailles' should be capitalized. 'Treaty' was left out. Poor guy. Also, 'Germans' should be capitalized.