Final answer:
Mary's specific question about dying T-shirts cannot be determined without additional context. Generally, common concerns in T-shirt dyeing involve dye quantity, soaking time, water temperature, and the number of test shirts.
Step-by-step explanation:
The question Mary had about dying the T-shirts does not appear among the options provided, as the correct context for Mary's question is missing. To accurately answer your query, it's essential to have the relevant context or the source material where Mary's question is presented. Typically, when dyeing T-shirts, questions can commonly revolve around factors such as dye quantity, soaking duration, water temperature, and the number of shirts used for testing the dye process. Each of these factors significantly influences the dyeing outcome and requires careful consideration to achieve the desired results.