The correct answer is d. Computer sizes have decreased with each new model created.
Computer sizes have nothing to do with the internet. They've become smaller due to technological development, not because of internet.
The issues that had to be dealt with when restoring Leonardo's last supper included all of the above: the experimental method used by Leonardo, the work of earlier restorers, changing levels of heat and humidity, and <span>a bomb falling on the monastery.
Leonardo was known for his experimental style of painting, many other artists tried to restore his painting, heat and humidity also had an effect on the painting, and in 1943, a bomb fell on </span><span>Santa Maria delle Grazie, where Last Supper was located, almost destroying the painting in the process.</span>
Ancient roman architecture if you need a more specific answer let me know :) hope this helps!
Barney is a dinosaur from our imagination