Which of the Following Evolutionary Changes Better Explains Morphological Differences

Multiple Choice

Which of the following evolutionary changes better explains morphological differences between different animals despite many common molecular mechanisms governing their development?

A) Changes in the types of genes responsible for key developmental processes.
B) Changes in regulatory DNA controlling expression of key developmental genes.
C) Changes in DNA-binding domains of key transcription regulators involved in development.
D) Changes in coding sequences of key developmental genes.
E) Changes in copy number of key developmental genes.