The cat broke her leg when she fell from the deck, so she had to wear a cast for six weeks.
a-Run-On
b-Comma Splice
c-Correct

summary - a brief statement or account of the main points of something.

main idea - the main idea is defined as the main point of a speech or piece of writing.

paragraph - a distinct section of a piece of writing, usually dealing with a single theme and indicated by a new line, indentation, or numbering.

i could of w this question but i don't see a " passage " .

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sorry ! ):