Arrange the following stages of oogenesis in order of their occurrence:

(A) Ovum
(B) Oogonia
(C) Primary oocyte
(D) Secondary oocyte
Choose the correct answer from the options given below:

The correct answer is (B), (C), (D), (A).

Oogenesis is the biological process by which female gametes (ova) are created. The stages of development occur in a specific sequential order:
1. Oogonia (B): These are the diploid precursor cells (germ cells) that multiply by mitosis in the fetal ovary.
2. Primary oocyte (C): Oogonia differentiate and develop into primary oocytes. These cells begin the first meiotic division (meiosis I) but remain arrested at the prophase I stage until puberty.
3. Secondary oocyte (D): After puberty, with each ovulation cycle, a primary oocyte completes meiosis I to produce a large haploid secondary oocyte and a small polar body.
4. Ovum (A): The secondary oocyte begins meiosis II and is arrested at metaphase II. It completes the second meiotic division only upon fertilization by a sperm, yielding a mature ovum (and a second polar body).

Therefore, the chronological sequence of stages in oogenesis is (B) Oogonia → (C) Primary oocyte → (D) Secondary oocyte → (A) Ovum.