what is used to sort dna into different lengths?\na. recombinant dna technology\nb. gel electrophoresis\nc…

Brief Explanations:

Gel electrophoresis is a technique that separates DNA fragments based on their size and charge. Smaller DNA fragments move faster through the gel matrix, allowing for sorting by length. Recombinant DNA technology combines DNA from different sources. Polymerase chain reaction amplifies DNA. Nuclear transfer moves a nucleus from one cell to another.

Answer:

B. Gel electrophoresis