To answer this question, I am assuming you are talking about a table in a word document or a spreadsheet. The answer is A - left-aligned.
For text to be centred, justified or right-aligned, the user needs to highlight the cell and set one of these options manually. You cannot set the text in a single cell to be left-aligned, centered and right-aligned at the same time. All three are mutually exclusive which means text can only be set to any one of the three justifications.