The answer to your question would be that the statement about quotation marks that is true is the one that reads as follows: "Quotation marks set apart short quotations" and "commas used to introduce short quotations appear outside the quotation marks" (I and III)
Short quotations should be sorrounded by quotation marks and usually followed by a parenthetical in-text citation. What is more, the commas introducing the quote should be outside the quotation marks. Take the following example:
a) However as one researcher points out, "science can be seen as an ideal and altruistic activity conducted for the best of mankind, where knowledge is in itself a value" (Simonsen, 2012, p. 46).