To be really honest, I think its a matter of opinion on which sentence is the strongest conclusion. To me, I think choice C is the best answer because it paints the contrast between the dog's wild instincts versus loyalty. I guess the conclusion should also mention that despite the abuse, Buck still learned to trust a human (even though one could easily understand why the dog would never trust a human after the abuse), so it shows just how powerful loyalty can be.
The correct answer is: Employment History and Personal Background Information.
A cover letter serves as your hook. The one who will read it may have a short span of availability. In writing a cover letter, you should highlight your strengths and past accomplishments so that they will be interested to read the attachments. Do not forget to include your contact information.
