1) Vaccum your house weekly.
2) Don't drop food crumbs on the floor. If you do, then sweep it immediately.
3) Clean your backyard well too, remove the weeds etc.
4) Wash the floors with water & soap weekly too.
The correct answer is D. A prepositional phrase means that it starts with a preposition. And in these examples, D is the only one that starts with a preposition "on".
Explanation:
we're born with 46 cause our parents give us 23 each unless there's a mutation causing a person to have more or less chromosomes.
