Answer:
Among the options given on the question the correct answer is option b.
They always should be in quotation marks.
Explanation: The short stories are important parts of literature where in a short and way the theme of the writing is expressed and also the language is also easy to understand for the readers.
However there are some rules about writing short stories. There is also the rule about the title of the short story.
The rule is title of the short story should always be in the quotation marks,fro example 'The Intruder' . But there is tricky part between using the Italic form in the title. The italic form is used for the collection of the short stories. Like 'The Intruder' is a short story and it is only quoted but not Italic. But this story is included in the collection of Andre Dubus named as the 'Dancing after Hours'.
The title of the short story doesn't require to be capitalized in every word. They also should not be underlined.
So it can be said that the title of the short stories only need to be quotation always.