A senior manager wants to know at what stage the business analyst (BA) is with...

Comprehensive and Detailed Explanation:The BAused an inappropriate communication methodby sending anoverwhelming document rather than summarizing progress concisely.

BABOK® Guide (Chapter 4.4 - Communicate Business Analysis Information)states thatBA communications should be clear, concise, and tailored to the audience's needs.

Including all stakeholders (Option A)is not necessarily wrong if relevant.

Business rules (Option C) and models (Option D)are valid content but do not make the communication method appropriate.