Who among the following can use Chart A to determine if they must file a tax return?

The ability to use Chart A to determine if one must file a tax return is based on specific criteria related to age, filing status, and income level. For Mrs. Fulton, at the age of 70, there are unique considerations regarding the filing requirement thresholds. Taxpayers aged 65 or older have higher income thresholds that exempt them from the necessity to file.

In this particular case, Mrs. Fulton, with an income of less than $10,000, falls below the threshold for her age and filing status, indicating that she is not required to file a tax return. This aligns her situation squarely within the parameters laid out in Chart A.

In contrast, while Mrs. Harlan and Mr. Emmet have age and income parameters, their circumstances do not fit the same exclusion criteria found in Chart A. Thus, Mrs. Fulton is the only one correctly identified as being able to utilize Chart A under the stated conditions.