溶蠟時間長

I don't know if my answer is correct or not ...
Firstly, candles and waxes are made by oil fractions that contain hydrocarbons.
An oil fraction consisting of hydocarbon molecules with more carbon atoms has a higher melting point.
溶蠟時間愈長, 代表了什麼?
This represents more carbon atoms is involved in 石蠟 while the others consist of less C atoms. So, it takes longer time for 石蠟 to melt.
The correct order should be ((according to their no. of carbon atoms)):
石蠟 > 大紅蠟燭 > 白蠟 > 生日蠟燭

hope this can help u with the question