Help pls it I really need it?

i believe the correct answer is d

answer; the above statement is (true);

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project