The best substitute for "symbols of royalty" among the options is: Option D: Regalia Here's why: A sceptre is just one specific symbol of royalty. A relic generally refers to an object of historical or sentimental value and is not specific to royalty. An emblem is a general symbol or sign and does not specifically denote royal symbols. Regalia specifically refers to the collection of items (like crowns, sceptres, robes, etc.) that symbolize royalty. Thus, "regalia" perfectly captures the idea of "symbols of royalty."