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Combinatorics Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

Susan is attending a talk at her son's school. There are $8$ rows of $10$ chairs where $54$ parents are sitting. Susan notices that every parent is either sitting on their own or next to just one other person. What is the largest possible number of adjacent empty chairs in a single row at that talk?

(A) $3$ (B) $4$ (C) $5$ (D) $7$ (E) $8$

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