Very obviously it isn't C or D and They might not like the "newest styles" so A they get what they want
C. Suffering. Siddhartha was a prince who spend all of his young years behind confined walls in a lavish estate. His father did this to prevent him from seeing the suffering that was common among the regular people. When Siddhartha climbed the wall in secret, he was astonished by the poverty, hunger, and disease among the commoners. This inspired him to seek inner understanding about ending suffering and started his path of becoming Buddha.
c. egg yolk because its mixed with glutinous material
Hatching and cross-hatching use two-dimensional lines to communicate the look of three-dimensional depth.
Hope this helps :)
~Davinia.