Which of the Following Is True About Standards for Punctuation

Which of the following is true about standards for punctuation in business writing?

A) The period should not be used to indicate the end of a declarative sentence.
B) The period should be used to indicate the end of an imperative statement.
C) Periods should not be used after abbreviations or initials.
D) A quotation within a quotation should not be enclosed with double quotation marks.
E) The titles of whole publications should not be italicized or underlined if one is handwriting.