What would be the number of chromosomes in the spermatids?

The correct answer is Option (1) → 23

Spermatogonia are diploid and have 46 chromosomes. The first meiotic division is the reduction division, so the secondary spermatocytes formed by it are haploid with 23 chromosomes. The second meiotic division does not halve the number again; it gives four haploid spermatids, and each of them also has 23 chromosomes.

NCERT Extract:
Gametogenesis – “… Each spermatogonium is diploid and contains 46 chromosomes. Some of the spermatogonia called primary spermatocytes periodically undergo meiosis. A primary spermatocyte completes the first meiotic division (reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes, which have only 23 chromosomes each. The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids (Figure 2.5).”

Figure 2.8 (a) Schematic representation of Spermatogenesis