Statement — “If you want to increase your writing speed, use a 0.7 pen.”\nAssumptions:\nI. Different types of pens are available.\nII. The person being advised understands what a 0.7 pen is.

Introduction / Context:
This is a recommendation connecting a goal (higher writing speed) to a tool choice (0.7 pen, i.e., 0.7 mm tip). We test which background beliefs are essential for the advice to be meaningful.

Given Data / Assumptions:

• Statement: Use a 0.7 pen to write faster.
• Assumption I: There exist different pen types (tip sizes/inks) to choose from.
• Assumption II: The listener already understands what “0.7 pen” means.

Concept / Approach:
For the recommendation to make sense, a choice set among pen types must exist (I). However, advice can be given even if the listener does not yet know the term “0.7”; clarification can follow. Hence II is not necessary to utter the recommendation.

Step-by-Step Solution:
1) Diversity of pens underpins the comparative recommendation → I necessary.2) Comprehension of the jargon is not a precondition to giving the advice → II unnecessary.

Verification / Alternative check:
Even if the listener asks “what is 0.7?”, the statement remains a coherent piece of advice that can be explained further.

Why Other Options Are Wrong:
Only II/Either/Both: over-commit. Neither: would make the comparative advice baseless.

Common Pitfalls:
Assuming understood jargon is always presupposed; recommendations often introduce new terms.

Final Answer:
Only assumption I is implicit.