• Let "B" represent the length of Bonna's song in minutes.
• Hadi's song is 1 minute longer than Bonna's, so it's (B + 1) minutes long.
• Niaj's song is 1 minute less than twice as long as Bonna's, so it's (2B - 1) minutes long.

We're given that the total time for these three songs is 12 minutes. So, we can set up the equation:

B + (B + 1) + (2B - 1) = 12

Now, let's solve for B:

B + B + 1 + 2B - 1 = 12

Combine like terms:

4B = 12

Divide by 4:

B = 3

Now that we've found the length of Bonna's song (B = 3 minutes), we can find the length of Niaj's song, which is 2B - 1:

Niaj's song = 2B - 1 = 2(3) - 1 = 6 - 1 = 5 minutes

So, Niaj's song is 5 minutes long, which matches one of the provided answer choices.

The correct answer is 5 minutes.