Final answer:
The shortcut for selecting a sentence in OO Writer is a triple click anywhere on the sentence.
Step-by-step explanation:
The correct answer to the question regarding the shortcut key to select a sentence in OO Writer (OpenOffice Writer) is C) Triple click anywhere on the sentence. When you triple-click on a sentence within a paragraph in OpenOffice Writer, the entire sentence will be highlighted and selected. This is a common feature in many word processors, including OO Writer, to quickly select text blocks such as a word with a double click and a paragraph with a triple click.
For clarity, double-clicking selects a word, while single-clicking only moves the cursor to the clicked location without selecting text. To select a full paragraph, you would also triple-click, but ensure that you're within the paragraph rather than on a specific sentence if your intent is to select the entire paragraph.