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.

A - there are four people in my family.

The topic sentence is the same as the main idea which summarizies the paragraph. The author of this goes into detail of each of the four people in their family. The other options are details that support the main idea / topic sentence.

judy jones is an attractive woman who receives attention from many men throughout the story.   despite her beautiful appearance, she is superficial and callous.   she is an aggressive woman who goes after any man she desires but she is not happy.   she is fickle and is never satisfied.   her beauty is only skin deep.   dexter breaks down because he knows his dreams are unattainable.   he believes that wealth and physical beauty are what will make him happy.   he soon realizes that she has lost her attractive looks.   it is not all what he had planned.

the star of david was known as the jewish star : d