The sentence that does not contain misplaced or dangling modifiers is C. Sitting in a chair on the porch, I looked at the clouds.
In A, it seems that the clouds are sitting. In B, it seems that the clouds are on the porch. In D, again it seems the clouds are sitting.
D. Bilbo fears all Wargs because they are allies of the goblins. He is assuming that every Warg is out to get them because they are not aligned with the goblins and the Wargs are.
Answer & Explanation: A habit is a settled or regular tendency or practice, especially one that is hard to give up. It is a regular or constant partner that can either pull you up or drag you down depending on the the habit being a good one or a bad one. Take for instance, having a habit of brushing twice a day (morning and evening) is a great helper as is a practice of good hygiene whereas a heroin habit is a drug abuse which can eventually be a huge burden as a result of the cost/ health implication.
Global warming also increases water vapor in the atmosphere, which can lead to more frequent heavy rain and snowstorms. A warmer and more moist atmosphere over the oceans makes it likely that the strongest hurricanes will be more intense, produce more rainfall, and possibly be larger.