Statement: The chairman decided to hold a grand function to celebrate the company’s silver jubilee next weekend and invited a large number of guests.\nAssumptions:\nI. Company officials will be able to complete all necessary preparations in time.\nII. A majority of the invited guests will attend the function.

Introduction / Context:
Deciding on a “grand” celebration and inviting many guests presupposes feasibility (arrangements) and purpose (attendance). We identify the necessary background beliefs enabling such a decision.

Given Data / Assumptions:

• Event date: next weekend (short lead time).
• Scale: grand, with many invitees.

Concept / Approach:
For the decision to be sensible, (I) operational readiness must be achievable, and (II) inviting many people must plausibly result in significant attendance; otherwise, the “grand” plan would be hollow.

Step-by-Step Solution:
1) Without I, the chairman’s plan would likely fail logistically.2) Without II, sending many invitations would not serve the function’s celebratory goal.3) Thus, both I and II underlie the decision.

Verification / Alternative check:
Large corporate events typically assume workable operations and meaningful turnout.

Why Other Options Are Wrong:
Each omits a critical enabler (operations or attendance) or denies both.

Common Pitfalls:
Assuming certainty is required; only reasonable expectation is needed (which is what assumptions represent).

Final Answer:
Both Assumption I and II are implicit.