The boiling point of a substance is when it starts passing from the its liquid form to its gaseous form (evaporating), which requires high temperatures for most substances.
The freezing point of a substance is when it starts passing from its liquid form to its solid form (hardening), which requires rather low temperatures for most substances.
Given the above, your answer is:
![\boxed{\bf~C.~The~freezing~point~of~a~substance~is~lower~than~its~boiling~point}](https://img.qammunity.org/2019/formulas/biology/middle-school/so9rmzbzkmli7rlfc1kbng8ikyryn6ufkx.png)
Hope it helped,
BioTeacher101