By definition, a gene is the portion of the DNA that codes for a specific trait, for example, for the color of your eyes.
So, the option is a section of DNA that codes for a specific trait
Transcription is the process of copying the information coded in the gene into an mRNA chain.
The option is the process of making RNA from DNA
mRNA is the RNA synthesized during the transcription, it is called "messenger RNA" because it transports the information from the nucleus to the ribosomes to make proteins.
The translation is the second step in protein synthesis where the mRNA is "read" by the ribonomes in order to create the aminoacid chain that will later result in a protein.