Explanation:

Here's a quick explanation of each option:

- Option 1: Population implosion

- Refers to a drastic reduction or shrinking in a population, often due to low birth rates or high death rates. ??

- Not related to rural-urban migration.

- Option 2: Population displosion

- Philip M. Hauser coined "population displosion" to describe the rapid explosion and movement of people, especially migration from rural to urban areas.

- Fits best with the question.

- Option 3: Population technoplosion

- Implies rapid change or growth due to technology.

- Not specific to rural-urban migration.

- Option 4: Population periplosion

- Not a standard demographic term; no recognized meaning in this context.

Correct answer is Option 2: Population displosion.