It would be 1 or 2 because if the number is higher than 5 you need to round up , if its lower than 5 you need to round down.
Explanation:
It is known that 1 gram contains 1000 milligrams. And, mathematically we can represent it as follows.
or
So, when we have to convert grams into milligrams then we simply multiply the digit with 1000. And, if we have to convert a digit from milligrams to grams then we simply divide it by 1000.
A because of the way it looks and how it works
There are O-H bonds in H2O. They have the intramolecular force of polar covalent bond.