The correct answer is A. 12543.
The first word is “a”. This is an indefinite article, which means that it does not specify which crowd is being referred to. The second word is “crowd”. This is a noun that refers to a large group of people. The third word is “large”. This is an adjective that describes the crowd as being big. The fourth word is “there”. This is a demonstrative pronoun that refers to the crowd. The fifth word is “was”. This is a verb that indicates that the crowd existed in the past.
The other options are incorrect because they do not correctly order the words in the sentence. Option B, 52143, has the word “there” in the second position, which is incorrect. Option C, 45132, has the word “was” in the third position, which is incorrect. Option D, 52431, has the word “large” in the fourth position, which is incorrect.