Punctuation

Option A is correct because it uses commas to separate items in a simple list of three nouns, including the standard Oxford comma before the conjunction. Option B is incorrect because it lacks necessary punctuation, while Option D is incorrect because semicolons should only separate list items that already contain internal commas.

Option B is correct because colons are used to introduce an explanation or clarification immediately after an independent clause. Option A is incorrect because a semicolon must separate two independent clauses, but 'to graduate' is only a phrase.

The clause 'who lives in Boston' is non-essential because it merely adds extra information about the sister, meaning it must be set off with commas. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.

• !Option C is incorrect because a semicolon cannot be used to set off a dependent relative clause.
• !Option A is incorrect because it is a simple plural noun with no possessive punctuation, leaving the relationship to 'jerseys' unclear.
• !Option A is incorrect because a semicolon must separate two independent clauses, but 'to graduate' is only a phrase.
• !Option B is incorrect because it lacks necessary punctuation, while Option D is incorrect because semicolons should only separate list items that already contain internal commas.

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