Questão 96812

Evaluate the assertions below regarding the correct use of punctuation in complex sentences.

I. In the sentence 'The mission had three primary objectives: to gather data, to analyze the samples, and to report the findings,' the colon is used correctly to introduce a list that explains or elaborates on the preceding independent clause.

II. The sentence 'She was a brilliant researcher; however, she struggled with public speaking' correctly uses a semicolon to join two closely related independent clauses, with the conjunctive adverb 'however' being appropriately placed.

III. The use of an em dash in 'The final result—though unexpected—was undeniably a breakthrough' is grammatically incorrect, as parentheses should have been used to set off the non-essential information.

Based on standard English punctuation rules, which of the assertions are correct?