1. What is the topic sentence?
2. What are the supporting details?

1. A topic sentence is the most important sentence in a paragraph. Sometimes referred to as a focus sentence, the topic sentence helps organize the paragraph by summarizing the information in the paragraph. In formal writing, the topic sentence is usually the first sentence in a paragraph (although it doesn't have to be).

2. Supporting details illustrate, interpret and unfold the main idea. They provide examples, reasons and statistics that make the main idea clear and convincing. There are two kinds of supporting details. ... The major details are essential to understand the main idea and the minor details support major details.

Explanation:

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the answer is   b suffix addition

the answer is a.

explanation:

the clause "looking toward the south" modifies "a funnel cloud." it's not really the cloud that's "looking," but grammatically, that clause is modifying the cloud.