B.) Garden
this is because "on" is one of many words that are commonly in prepositions. Then to find the object of the preposition, you have to ask yourself, "on {or insert whatever your word is here} what", because the object of your preposition is the subject of the preposition. :)
I hope that makes sense!
Seven business functions that can be seen in the supermarket
are the following, sales, accounting, marketing, computing, purchasing,
advertising and human resources. These are business functions for they are
activities that are needed by the field of business in order to keep going and
to survive.