Step 1: Understanding the Question:
This question tests knowledge of thinning types.
Step 2: Detailed Explanation:
Advance thinning is the removal of dominated trees in the lower crown classes.
It favours the growth of the best trees in the lower canopy.
Free thinning (A): Removal of trees that compete with the best trees.
Crown thinning (C): Removal of trees in the upper crown.
Ordinary thinning (D): Not a standard term.
Thus, the correct answer is advance thinning.
Step 3: Final Answer:
Thus, the removal of dominated trees is called advance thinning, which corresponds to option (B).
[0.5cm]