If we're talking about excel functions, A is your answer.
The COUNT function does exactly that (with modifications of it counting specific things e.g. COUNTA, COUNTIF, etc)
MIN returns the minimum value in the selected range.
SUM returns the sum of the values in the selected range.
ABS returns the absolute value of the selected cell.
Answer:
Click home tab, click conditional formatting, click new rule, use formula to determine
