The answer would be b. in the nucleus DNA instructions are copied as RNA messages. This is called translation. The RNA then takes that information to the ribosome where it is transcribed into amino acids, which will form a polypeptide chain and create a protein! Hope this helped :)
So that when the cell splits in two, both cells have the correct amount of dna to function
Just like architectural plans are blueprints on how the Megalopolis factory should be built, so is the DNA on how the cell should be built. They all store information. The plans have, for example, the number of rooms and dimension of the factory, while the DNA has genes that code for proteins (the actual building block for the cells).