the answer of this question is the poem "A Valentine for Ernest Mann" because it is considered a shorter piece of work.
The title that should be enclosed in quotation marks is option A.
The poem A Valentine for Ernest Mann.
Explanation: Quotation marks are usually used for the titles of shorter pieces of work such as poems, articles, book chapters, songs, T.V. episodes, etc.
Quotations marks can also be used with direct quotes, with titles of certain works, to imply alternate meanings, and in order to write words as words. Furthermore, commas and periods always go inside the quotation marks in American English.
