The correct answer is C. Anaphase 1.
Anaphase 1 is termed as the phase of meiosis where where tetrads are being separated as homologous chromosomes whereby they are pulled to the opposite poles of the cell.
It is during anaphase 1 stage which is found in meiosis where the cell starts to lengthen. There are two homologs for each chromosome pair which moves towards opposite poles and it separates.
In this phase chromatids remains together as a complete replicated chromosome.