The is often represented as a chart in which a specific sequence of bases in mrna (a codon) is used to represent each amino acid building block found in the world of proteins.

Genetic code
The process whereby nucleotide sequence of a gene is translated into the amino acid sequence of a protein through mRNA can be refers to as genetic codes. Genetic code is a set of relationship between the amino acid and codons. 

The correct answer is option B.

B) an emotional appeal to emphasize the United States' commitment to justice.

Here, Kennedy emphasizes the United States' commitment to providing aid and support to people struggling everywhere around the world. He makes an emotional appeal by using words like- huts and villages of half the world, a free society, and because it is right.