Multi-choice problem: Choose from the options at the end, and answer how do you do this: How to make your lava for your DIY lava lamp?

Select from:
(I) To paint the lava (mineral oil), place a colored pencil and dissolve it onto the oil.You need to dip your fingers into the oil then rub the colored pencil into it.;
(II) To paint the lava (mineral oil), place a crayon and dissolve it onto the oil.You need to dip your fingers into the oil then rub the crayon into it.;
(II)