The answer is C.
Formulas within table cells always begin with an equal sign.
Here is the sample of some of the formulas :
1. Sum (equation)
=SUM(5, 5) or =SUM(A1, B1) or =SUM(A1:B5)
2. Count ( to count number of cells or rows)
=COUNT(A1:A10)
3. Trim ( Get rid of any space in a cell)
=TRIM(A1)
4. Vlookup ( to look up data from a vertically structured table)
=VLOOKUP(lookup_value, table_array, col_index_num, range_lookup)
5. if statements
=IF(logical_statement, return this if logical statement is true, return this if logical statement is false)
