Final answer:
The correct punctuation would be: 'In 1989, a group of computer scientists created a computer program called Chinook; consequently, the program's algorithm finally became unbeatable in 2007.' The error in the sentence is the misuse of a semicolon; it should be before 'consequently' and followed by a comma to correctly join two independent clauses. The correct statement is second.
Step-by-step explanation:
- The semicolon error in Brendan's sentence is that the semicolon should appear before the conjunctive adverb 'consequently,' and the conjunctive adverb should be followed by a comma.
- The correct punctuation would be: 'In 1989, a group of computer scientists created a computer program called Chinook; consequently, the program's algorithm finally became unbeatable in 2007.'
- The semicolon is used to join two independent clauses that are closely related, while the conjunctive adverb followed by a comma helps provide a smooth transition between the two ideas.