Based on information in The Evolution of Useful Things, what prompted the creation of waterproof sandpaper? salesman being embarrassed by faulty products
the need for a considerable amount of sanding
the poisoning of automobile industry employees
Richard Drew's work as a lab technician

i have a basic answer but if you want a more in depth

sorry but can you explain the question because i didn’t understand it

answer: b) bubbling its way

explanation: an adjective is a word or a group of words that modifies a noun (name, thing, place,

in this case, the first option "to heartily enjoy" isn't describing or modifying any noun, the third option "hiking along merrily" is describing an action but it doesn't modify any noun, the last option "beside us" is just a preposition that indicates position, so the correct answer is the second one: "bubbling its way" because it is modifying the noun "stream".