How many sperms and ova will be formed by a primary spermatocyte and a primary oocyte respectively?

The correct option is C Four, One
Spermatogonia differentiate and form primary spermatocyte. Primary spermatocyte undergoes meiosis I and forms two secondary spermatocytes. Each secondary spermatocyte undergoes meiosis II and forms two spermatids that transform into sperms. Hence from one primary spermatocyte four sperms are produced.

The production of ovum is called oogenesis in which an oogonia divides mitotically and differentiates into the primary oocyte. Primary oocyte divides by meiosis I to form a secondary oocyte and first polar body. The secondary oocyte undergoes meiosis II to form the ovum and second polar body. The two polar bodies released will degenerate. Hence from one primary oocyte only one ovum is formed.