Will give brainliest Since Example #2 gives a title
and not an author's name, we
can assume the source is
probably

A. an unsigned letter from one scientist to
another.
B. an article in which the author wanted
to remain anonymous.
C. an article from the internet or a
government or other such source that
does not list authors.
D. a journal article.

a low four-wheeled open carriage of a kind formerly used in russia.

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2

explanation:

a is the indefinite article