Step 1: Understanding the Question:
This question tests the grammar rules for forming question tags in English.
Step 2: Key Formulas and approach:
Standard rules for creating question tags:
1. If the main statement is affirmative (positive), the question tag must be negative.
2. If the main statement is negative, the question tag must be positive.
3. The tag uses the same auxiliary verb as the main statement. If no auxiliary exists, "do/does/did" is used.
4. The subject pronoun of the tag must match the subject of the main statement.
Step 3: Detailed Explanation:
$\bullet$ The statement is "She is a lawyer", which is an affirmative statement.
$\bullet$ Therefore, the question tag must be negative. This eliminates Option (A) "is she" and Option (C) "does she".
$\bullet$ The verb used in the statement is "is" (a form of the primary verb "to be").
$\bullet$ The question tag must use the same verb. The negative contraction of "is" is "isn't". This eliminates Option (D) "doesn't she".
$\bullet$ Combining "isn't" with the subject pronoun "she" gives the correct tag: "isn't she".
Step 4: Final Answer:
The correct tag is "isn't she", making Option (B) the correct answer.