The Major Difference Between Single Nucleotide Variants (SNVs)and Copy Number

The major difference between single nucleotide variants (SNVs) and copy number variants (CNVs) is that:

A) SNVs are duplicated in tandem and involve complex gains or losses of homologous sequences,whereas CNVs involve simple sequence changes.
B) CNVs occur in stretches of DNA ranging from 100 to millions of bases in size,whereas SNVs involve single base changes.
C) SNVs are always associated with disease,whereas CNVs are not.
D) SNVs are involved in gene amplification by producing more than two functional genes in a genome.