In English vocabulary, choose the correct one word substitute for the phrase "a place where soldiers live".

Introduction / Context:
In English vocabulary, one word substitution questions test whether you can connect a descriptive phrase with a precise term. The phrase given here is a place where soldiers live, which refers to their official living quarters provided by the army. The correct word is frequently used in news, history books, and general reading, so recognising it is important for both competitive exams and everyday comprehension.

Given Data / Assumptions:

• The phrase to be replaced is a place where soldiers live.
• The setting is military, not civilian housing.
• Four options mention different kinds of structures or military related places.
• We need the standard English term for soldiers’ living quarters in an army camp or base.

Concept / Approach:
In military English, the word barracks is used for buildings where soldiers live and sleep. Even though the form looks plural, it can function as a singular or plural noun depending on context. Tanks are vehicles used in battle, shacks are rough huts not specifically military, and ordnance depots are storage places for weapons and ammunition. By matching meaning and common usage, barracks clearly fits the description of a place where soldiers live.

Step-by-Step Solution:
Step 1: Focus on the key idea in the phrase, namely soldiers' living quarters. Step 2: Recall common military vocabulary such as barracks, base, camp, and depot. Step 3: Match barracks with the definition buildings where soldiers live. Step 4: Check that other options describe different things like vehicles or storage areas. Step 5: Conclude that barracks is the only correct one word substitute.

Verification / Alternative check:
You can verify your answer by putting each option into a sample sentence. For example: The soldiers returned to the barracks after training sounds natural and correct. If you try The soldiers returned to the tanks after training, the meaning changes completely because tanks are fighting vehicles. The sentence The soldiers returned to the ordnance depots is also wrong because depots store weapons, not people. This quick usage test confirms that barracks is the only option that fits the original phrase.

Why Other Options Are Wrong:
Tanks are armoured fighting vehicles used in battle, not residential buildings for soldiers.

Shacks are small, roughly built huts and can describe any poor quality dwelling, not specifically a formal army residence.

Ordnance depots are places where arms, ammunition, and military equipment are stored, not where soldiers normally live.

Common Pitfalls:
Learners sometimes confuse different military terms because they all appear in war related contexts. It is helpful to link each word with its main function: barracks for living, depots for storing weapons, tanks for fighting, and shacks for informal or poor housing. Keeping such associations in mind will make one word substitution questions easier to handle in exams.

Final Answer:
The correct one word substitute for a place where soldiers live is Barracks.