|Sounds like homework, but I'll help out anyway.|
I'd say that if you can only choose one answer, choose # 3.
The reason I say that is because of the way # 1 is worded.
"Cells can be date, number or formula cells, amongst others "
Cells can be formatted as dates, numbers, text, amongst others. In my mind, their the use of the word "or" makes the statement False.
For example, a cell that displays 3/11/2012 could contain the actual Date 3/11/2012 or it could contain a formula that evaluates to 3/11/2012.
So to say that a cell could be a date or a formula cell would be False since it could be both.
Note: I'm not saying that I'm correct since I didn't write the question, but if you're only allowed to choose 1 answer, and I feel that # 3 is True, I went looking for a way to make #1 False.
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