Question

question 10
instructions: read the paragraph below and answer the question(s) that follow.
(1) most of the ingredients in cigarettes cause serious damage to health, but three of the worst are tar, carbon monoxide, and nicotine. (2) tar, the brown, sticky substance produced by a burning cigarette, is a messy mixture of hundreds of toxic chemicals. (3) at least forty - three of those chemicals cause cancer. (4) the other two destructive substances, carbon monoxide and nicotine, contribute to heart disease. (5) carbon monoxide prevents red blood cells from carrying a full load of oxygen. (6) therefore, it reduces the bodys oxygen supply. (7) at the same time, nicotine is not only constricting blood vessels and impairing blood flow but also stimulating the heart, making it beat faster and crave more oxygen. (8) consequently, carbon monoxide and nicotine work together to damage the cardiovascular system.
how many causes does the writer include to develop the topic sentence?
a 3
b 4
c 5
d 2

Explanation:

Step1: Identify the topic sentence

The topic sentence is "Most of the ingredients in cigarettes cause serious damage to health, but three of the worst are tar, carbon monoxide, and nicotine."

Step2: Count the causes

The causes developed for the topic - sentence are tar causing cancer (point 3), carbon monoxide preventing red - blood cells from carrying full oxygen and contributing to heart disease (points 4 and 5), and nicotine constricting blood vessels, impairing blood flow, and stimulating the heart (points 6 and 7). There are 3 main causes in total.

Answer:

A. 3