Identify the Dangling Modifiers

One sentence of each pair contains a dangling modifier. Identify both the dangler and the correct sentence.

1A. Having misunderstood the assignment. I received a low grade on my paper.
1B. Having misunderstood the usignment, my paper got a low grade.

2A. Exhausted after 14 hours of driving, the exit to Denver was a welcome sight.
2B. Because we were exhausted after 14 hours of driving, the exit to Denver was a welcome sight.

3A. Having stood in the oily marinade for six hours, you are now ready to grill the meat.
3B. Having stood in the oily marinade for six hours, the meat is now ready to be grilled.

4A. As the spider painstakingly repaired the damaged web. I marveled at its skill and patience.
4B. Painstakingly repairing the damaged web, I marveled at the spider's skill and patience.

5A. Approaching the Continental Divide, there was a noticeable drop in temperature.
5B. Approaching the Continental Divide, we noticed a drop in temperature.

6A. The archaeologists could not decipher the inscription covered with the grime of centuries.
6B. Covered with the grime of centuries, the archaeologists could not decipher the inscription.

7A. To avoid overexposing the picture, use a light meter.
7B. To avoid overexposing the picture, a light meter should be used.

8A. Meeting Lou after geology class, he suggested a handball game.
8B. Meeting Lou after geology class, I suggested a handball garne.

9A. If unable to attend, please call the reservation clerk.
9B. If unable to attend, a call to the reservation clerk would be appreciated.

10A. Seen from miles away, the mountain looks like a cloud.
10B. Seen from miles away, one might think the mountain was a cloud.

11A. Having only two days of holiday, it might be sensible just to stay home.
11B. Having only two days of holiday, we might just as well stay home.

12A. This being payday, I am momentarily without financial worries.
12B. Being payday, I am momentarily without financial worries.