Final answer:
Allison looks forward to tubing, but her mother is nervous.
Step-by-step explanation:
Allison's perception of tubing compared to her mother's is b) Allison looks forward to tubing, but her mother is nervous. In the passage, it is stated that Allison thinks tubing is calm and beautiful while her mother worries for Allison's safety. This is shown when Allison's mother says "I shouldn't think you'd want that shawl!" implying that she is concerned about Allison being cold or getting injured while tubing.