'The sweet, smoky scent of toasted marshmallows found her nose as she licked melted chocolate from her fingertips." This is your answer as it explicitly states the sense of smell.
The sentence which uses correct punctuation is C. In time, of course, all issues get resolved, but not necessarily in the way you would like.
In A, the comma before <em>he was concerned </em>should be a dash. In B, there should be a colon before <em>a flashlight, </em>not a semi colon. In D, there should be a comma before <em>yet, </em>and not a colon.
Jack and I - we
Books - it
Sister - she
You and Dave - they
Plane - it
Sunshine - it
Cheese - it
Cactus - it
Parents - they
Pamela - she
News - it
Scissors - they
Geese - they
Flowers - they
Piano - it
School - it
Daughter - she
Milk - it
Children - they
Sugar - it
Feet - they
Bicycle - it
Ann and Kate - they
Tennis - it
Son - he
Mice - they
Sky - it
Shop - it
Buses - they
Papers - they
Mr. Green - he
Brother-in-law - he
Picture - it
Friendship - it
Dolphin - it
The Ringgs family - they
I do not know the answer to this question
Killing North Korean leader Kim Jong-un<span> might seem like a good solution, but it won't prevent more nuclear tests or war.</span>