Select the option that can be used as a one-word substitute for the given group of words.
A place for storage of arms and ammunition

The correct answer is Arsenal.

Let's analyze the given group of words and understand the meanings of all the options to find the correct one-word substitute:

The given phrase is: "A place for storage of arms and ammunition"

1. Arsenal: An arsenal is a place where military weapons, ammunition, and other military equipment are made, stored, or repaired. This fits the definition perfectly.
2. Mint: A mint is a primary facility where a country's coins are manufactured and produced under government authority.
3. Monastery: A monastery is a building or complex of buildings comprising the domestic quarters and workplaces of monastics, monks, or nuns.
4. Scullery: A scullery is a small room next to the kitchen in a large house, traditionally used for washing dishes and other dirty household work.

Therefore, the most appropriate one-word substitute for "A place for storage of arms and ammunition" is Arsenal.