Statement: Youngsters are often found staring at obscene posters.\nCourses of Action:\nI. Punish children if they are found doing so.\nII. Ban the public display of such materials.

Introduction / Context:
The issue involves minors being exposed to obscene imagery in public spaces. Effective courses of action should address the source of the problem while being proportionate and developmentally appropriate for children.

Given Data / Assumptions:

• Exposure occurs in public view where minors can see the material.
• Children’s curiosity is natural; culpability primarily rests with those displaying such content.
• Authorities can regulate public displays.

Concept / Approach:
Target the cause, not the symptom. Public decency and child protection norms focus on restricting display/distribution rather than penalising minors for looking. Education and awareness complement regulation, but punitive action against children is misplaced.

Step-by-Step Solution:
1) Enforce rules against public display of obscene materials (licensing checks, takedowns, penalties).2) Encourage complaint channels for communities to report violations.3) Promote age-appropriate awareness in schools and guardianship guidance.

Verification / Alternative check:
Removing obscene displays reduces exposure opportunity regardless of the number of curious onlookers; punishing children neither removes the content nor addresses root causes.

Why Other Options Are Wrong:
Only I: misdirected; punishes minors. Either/Both/Neither: “Either” equates an unsuitable measure with the correct one; “Both” wrongly endorses punishment; “Neither” ignores a clear remedy.

Common Pitfalls:
Assuming deterrence via punishment of minors; ignoring enforcement against advertisers/vendors.

Final Answer:
Only II follows.