I would say D because mechanical weathering is the breaking up of rocks by physical forces
I think this is what you’re looking for hopefully
because its the power house of the call
It indicates what elements is composed by and how many atoms of one element are linked to the other.
For example, this is the formula for table salt is:
NaCl
The formula indicates that table salt (sodium chloride) is composed by sodium (Na) and chlorine (Cl) on a 1:1 ratio.
Hope it helped,
BioTeacher101