**B. Hybridization**

Hybridization is the correct answer because Pusa-RH-10 is a variety of rice produced through the process of hybridization.

**Explanation:**

Hybridization is a breeding technique used to develop new varieties of crops by crossing two genetically diverse parents. It involves the controlled pollination of one plant with the pollen of another plant to combine desirable traits from both parents.

In the case of Pusa-RH-10, it is a variety of rice that has been developed by crossing two different varieties of rice plants with specific traits. The specific parents used in the hybridization process are not mentioned in the question, but they would have been selected based on their desired traits such as high yield, disease resistance, or improved quality.

During the hybridization process, the male reproductive organs (stamens) of one parent plant are emasculated or removed to prevent self-pollination. Then, the female reproductive organs (pistils) of the emasculated plant are pollinated with the pollen from the selected male parent. This results in the formation of hybrid seeds.

These hybrid seeds are then grown into plants, and the resulting plants are evaluated for their performance and traits. The plants showing the desired traits are selected for further breeding and seed production. This process is repeated for several generations to stabilize the traits in the new variety.

Pusa-RH-10 is a specific variety of rice that has been developed through this hybridization process. It is important to note that hybridization is different from genetic modification (GM). In genetic modification, the plant's DNA is directly manipulated to introduce or modify specific genes, while in hybridization, the crossing of plants occurs naturally through pollination.

In conclusion, Pusa-RH-10 is a variety of rice that has been developed through the process of hybridization, which involves crossing two genetically diverse parent plants to combine desirable traits.

Pusa Rice Hybrid 10 (PRH 10) is the first aromatic Basmati Hybrid developed from public sector Agricultural Research Institute and released by Central Variety Release Committee (CVRC) in 2001.