The best option here is D) There are many ways to teach a child about responsibility besides taking care of a dog, such as homework and other activities
Lets use the method of elimination to justify this.
A) is a repetition of Sentence 3. So this is out of the equation.
B) communicates an idea that is contrary to the theme of the paragraph which can be summarised as "Teaching a Child to responsibility as well as manage himself and other tasks". Responsibility means doing all that you ought to do without prejudice to the other by taking each one at the right time
C) States that taking care of the family do is priority. Again this runs contrary to the main idea of the paragraph.
Having eliminated A, B and C, we are left with D.
Sentence D simply implies that a there are a number of things which teach a child how to be responsible, taking care of a dog, doing his or her homework and carrying out other activities are examples of such.