Final answer:
Gluten-free dumplings are the safest option for a customer with gluten allergy, while fried rice may be safe depending on its preparation. Traditional dumplings, noodles, and dishes with soy sauce usually contain gluten and should be avoided.
Step-by-step explanation:
If a customer is allergic to gluten, the best dish to recommend would be gluten-free dumplings (option B). Since wheat, which contains gluten, is a common ingredient in traditional dumplings, noodles, and soy sauce, those options would typically not be safe for someone with gluten intolerance or celiac disease. Fried rice (option D) might sometimes be an acceptable option, but it would depend on whether the rice was cooked with soy sauce or other potential sources of gluten. It's essential to ensure that the food is prepared in an environment free from cross-contamination with gluten-containing foods to avoid any adverse reaction.