Answer:
The answer is A. Active cell.
Step-by-step explanation:
The active cell is the cell that is currently selected and can be edited. It is indicated by a heavier black border around it.
The other answer choices are incorrect:
SUM cell: A cell that contains the SUM function to calculate the sum of a range of cells.
Basic cell: A cell that contains a simple value, such as a number, text, or date.
TREND cell: A cell that contains a trendline, which is a line that shows the general direction of a set of data points.
Therefore, the correct answer is A. Active cell.