Concept:A strong argument must be directly relevant, factual, and important to the given statement.
Explanation:Argument I states that training costs would be prohibitive and
1 year of labour would be lost.
These are practical economic drawbacks, so this argument is strong.
Argument II says army training helps make better citizens, but “better citizens” is vague and subjective.
Therefore, Argument II is weak.
Hence, only Argument I is strong.
Answer:Option A: if only argument I is strong.