Select the most appropriate option that can substitute the highlighted segment in the given sentence.
Snow fluttered in Josie’s window as she got ready for work.

Correct option is B

Option b is correct.
Use the preposition “outside” because snow occurs outdoors; “fluttered outside Josie’s window” is the natural, idiomatic expression.
Why not (a) inside…: Snow does not flutter inside a closed window; this is illogical in normal context.
Why not (c) at Josies window: “at” is a point-location preposition and sounds awkward here; also Josie’s needs an apostrophe (possessive).
Why not (d) No substitution: “in Josie’s window” is incorrect in standard usage for falling snow.
Correct: Snow fluttered outside Josie’s window as she got ready for work.