Option 1 -> The rugged terrain made it difficult for Michael to climb out himself, but wasn't the reason passers-by couldn't rescue him.
Option 2 -> The passage states the vehicle was "amid the shoulder-high brush" which prevented passers-by from seeing anyone inside, even if they glimpsed the vehicle.
Option 3 -> Michael's injuries prevented him from climbing out on his own, but didn't affect whether passers-by could spot him.
Option 4 -> The angle made it hard for Michael to exit, but wasn't mentioned as blocking the view of passers-by.
Hence, Option 2 -> The text explicitly mentions that even if passers-by glimpsed his vehicle "amid the shoulder-high brush," they "wouldn't be able to see anyone inside" due to the high foliage obstructing their view -> correct