PLEASE HELP NEED ASAP DUE IN A LITTLE! THANK YOU! QUESTIONS BELOW!

How do you turn Carbon (atomic number: 6) to Gold (atomic number: 79)?
1.You take away 6 protons from Carbon
2.You add 73 protons to Carbon
3.Wait for Carbon to go through a half life
4.You combine two Carbon atoms together

If the half life of Uranium-234 is about 25 thousand years, and I start off with 200 grams of it, how much of it would remain after 100 thousand years?
1. 100 grams
2. 50 grams
3. 25 grams
4. 12.5 grams