The process of transcription follows which principle?

In eukaryotes,$\text{RNA}$ polymerase-$I$ is responsible for the synthesis of:

Which molecule transfers genetic information from the nucleus to the ribosomes?

The main enzyme for transcription is .....

Find out the correct statement about transcription $:-$

Given below are two statements, one is labelled Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A) :$ In eukaryotes, primary transcripts $(hnRNA)$ contain both exons and introns, and introns are non-functional.
Reason $(R) :$ In bacteria, the $mRNA$ does not require any processing, and transcription and translation take place in the same compartment.
In the light of the above statements, choose the most appropriate answer from the options given below $:$