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Answer: c
Explanation: When p & n region come together diffusion takes places & a depletion
region is established with opposite charges on both the sides of the junction.
When a physical contact between a p-region and n-region is established, the most likely occurrence is the formation of a p-n junction. This leads to the diffusion of charge carriers (holes from the p-region and electrons from the n-region) across the junction, resulting in the creation of a depletion region and establishing an electric field. This process is fundamental to the operation of various semiconductor devices, such as diodes and transistors.