Concept:Chromosomes align at the cell equator during a specific phase of mitosis called metaphase.
Explanation:Mitosis has four main stages: prophase, metaphase, anaphase, and telophase.
During metaphase, the spindle fibres pull the chromosomes to the centre of the cell.
The chromosomes line up around the equator, forming the metaphase plate.
This arrangement ensures that each daughter cell receives an identical set of chromosomes.
The stage described in the question is therefore metaphase.
Answer:Metaphase — Option B.