The committee included Dr. Smith, a linguist Dr. Jones, a historian and Dr. Lee, a sociologist.
Correct: A
Option A correctly uses semicolons to separate items in a complex list, where each item itself contains commas (e.g., 'Dr. Smith, a linguist'). This prevents confusion and clarifies the main divisions of the list. Option B incorrectly uses only commas, which makes it difficult to distinguish between the main items and the descriptions within each item. Options C and D misuse semicolons and commas, creating confusion.