Answer:
As I think the answer is D.
Genetic engineering is applied to techniques like DNA cloning in which the steps are: step 1: DNA cutting from the parent source; step 2: DNA cut is pasted into the matrix to be modified; step 3: matrix is introduced to the host cell and step 4, vector DNA is isolated. Answer then is B.
This might represent evolution of a species or the influence of the environment on the expression of a genotype.
They all look right to me sorry if you get any wrong...