Which is the topic sentence of the following paragraph?

there are four people in my family. the family consists of my father, my mother, my younger sister and me. my sister is younger than me by two years. we go to school together and return together by the school bus. i am studying in class ninth and she is the student of class seventh. on return from the school, we play together. i have a pet dog. my father is working as a janitor. my mother is a housewife and looks after the household. she remains busy throughout the day. she me and my sister in completing our homework. pretty soon we will be adding another member because my mom is pregnant.
question 16 options:

a)

there are four people in my family.

b)

my sister is younger than me by two years.

c)

i have a pet dog.

d)

my father is working as a janitor.

Read the passage from sugar changed the world. sugar is a taste we all want, a taste we all crave. people throughout the planet everywhere have been willing to do anything, anything at all, to get that touch of sweetness. we even know exactly how thrilling it was to taste sugar for the first time. when the lewis and clark expedition met up with the shoshone, who had little previous contact with old world products, sacagawea gave a tiny piece of sugar to a chief. he loved it, saying it was "the best thing he had ever tasted." sugar created a hunger, a need, which swept from one corner of the world to another, bringing the most terrible misery and destruction, but then, too, the most inspiring ideas of liberty. sugar changed the world. we begin that story with a man who could never know enough. how does the conclusion of the prologue support the authors’ purpose? select two options. it introduces the topic that will be addressed next. it provides information about the authors. it states why the topic is relevant to readers. it cites sources the authors used in the text. it explains how the authors came to study the subject.