The answer is B. - Ivan Pavlov
I believe the answer is: panel discussion.
In a panel discussion,we put several speakers who held a certain level of credibility regarding the topic and give the audiences the chance to publicly debate their questions or opinion regarding the topic. This type of discussion is mostly used to delve in politics, new/upcoming scientific development, or the problems that involve general well being of the community as a whole.
The answer is a the population will have a natural growth increase because once the birth rate is greater than the death rate there is a population growth
The Monarch was the supreme ruler. Ladies were high ranked nobles, but not rulers, while Serfs were almost the same as peasants.