Critical Reasoning — Implicit Assumptions Statement: I have written several letters to the branch manager regarding my account but have not received any reply so far. Assumptions: I. The branch manager is expected to read letters received from customers. II. The branch manager is expected to reply to letters received from customers.

Introduction / Context:
The speaker complains about not receiving a reply from a bank’s branch manager. Such a complaint presupposes norms of service: reading and replying to customer correspondence.

Given Data / Assumptions:

• Multiple letters were sent; no reply yet.
• Assumption I: managers should read customers’ letters.
• Assumption II: managers should respond to customers’ letters.

Concept / Approach:
For a grievance to be meaningful, there must be an expectation violated. Banking service ethics presume both perusal and response to account-related letters from customers.

Step-by-Step Solution:

Verification / Alternative check:
Negate I or II and the writer’s grievance loses its basis: without an expectation to read or reply, the absence of response is not a fault. Therefore both are implicit.

Why Other Options Are Wrong:

• Only I or only II: ignores the other service norm required to make the complaint rational.
• Either/Neither: do not reflect the dual expectations inherent in customer-service correspondence.

Common Pitfalls:
Separating procedural reading from the communicative duty to reply. In customer service, both are assumed together for accountability.

Final Answer:
Both I and II are implicit