Answer:
The correct answer is remnants.
Step-by-step explanation:
According to the Merriam-Webster Dictionary, the word relic has different meanings. One of them refers to and object that is associated to a saint or a martyr and it is venerated due to this.
Another definition is a survivor or a remanent left after something decays or disappears. Relic is also an outdated practice or belief.
Based on this definition, remnants can be used as a synonym of this word.