Final answer:
Sieving is the process described in the question, involving passing a substance through a mesh or sieve to separate smaller particles from larger ones.
Step-by-step explanation:
The process described in the question, sifting until free-of-coarse gritty particles, is known as sieving. Sieving involves passing a substance through a mesh or sieve to separate the smaller particles from the larger, coarser ones.
An example of sieving is when you pass sand through a sieve to separate out any large rocks or pebbles. The smaller grains of sand will pass through the sieve, while the larger particles will be retained.
So, the correct answer is A. Sieving.