They sustained life threatening injuries in the forest fire, their names, ironically, are included on the list of suspected arsonist.

How would you correct the sentence structure error?

a. separate the two clauses with a colon
b. join the two independent clauses with a semicolon
c. create three shorter sentences
d.change the number of the verb

B?

Yes, B.

Actually, there are a couple of other corrections that are needed.

life-threatening (needs the hyphen)
arsonists (plural, not singular, is needed)

No, the correct answer is not B. To correct the sentence structure error, you would choose option C, which suggests creating three shorter sentences.

Here's how you would correct the sentence using option C:

"They sustained life-threatening injuries in the forest fire. Ironically, their names are included on the list of suspected arsonists."

By splitting the original sentence into three shorter sentences, you provide more clarity and improve the overall structure.