Question

air pollution essay
persuasive essay outline
introduction
thesis statement:
air pollution is a problem because it can cause lung cancer, heart disease, and asthma; the government must take action to fix this.
body paragraph 1:
topic sentence:
firstly, air pollution can cause lung cancer after exposure for long periods of time.
body paragraph 2
topic sentence (highlighted)
body paragraph 3
topic sentence:
conclusion

choose the correct answer
which should be used for the topic sentence of body paragraph 2?
a plant thats quickly gaining interest in the science community is mars...
polluting gases show that they are actually toxic, complex chemicals.
secondly, air pollution can cause heart disease after exposure for long periods of time.

Explanation:

The essay is about air pollution and its health impacts. Body Paragraph 2 (second body paragraph) should have a topic sentence that continues the discussion of air pollution's health effects, likely a new aspect or a continuation with a transition. The option "Following some time, they are actually hazardous complications." (assuming a typo and it's about long - term effects after exposure) or the one with "Secondly" (if Body Paragraph 1 had "Firstly") would make sense. Wait, looking at the first body paragraph's topic sentence: "Firstly, air pollution can cause...", so the second body paragraph's topic sentence should use "Secondly" to show the second reason/effect. So the option "Secondly, air pollution can cause heart disease after exposure to long - periods of time." (the third option) is the correct topic sentence for Body Paragraph 2 as it follows the first paragraph's structure (firstly, secondly) and continues the discussion on health impacts of air pollution.

Answer:

The correct option for the topic sentence of Body Paragraph 2 is: "Secondly, air pollution can cause heart disease after exposure to long - periods of time." (the third option among the given choices in the image)