Concept:A strong argument must be directly relevant and significant to the statement, while a weak argument is based on trivial or avoidable concerns.
Explanation:Argument I is strong because a complete ban on firecrackers would lead to large-scale unemployment of workers.
Argument II is weak because the issue of child labour can be dealt with by enforcing labour laws, and it does not justify a complete ban on firecrackers.
Argument III is strong because banning firecrackers would meaningfully reduce noise and air pollution.
Argument IV is weak because making occasions lively is not a strong reason against serious environmental and health concerns.
Therefore, only arguments I and III are strong.
Answer:Option B — Only I and III are strong.