Final answer:
An Éclair has a crispy outer shell and hollow interior filled with custard or cream, making (C) Eclair the correct answer to the question.
Step-by-step explanation:
The type of pastry being described is known as an Eclair. An éclair typically features a crispy outer shell made from choux dough and a hollow interior that is commonly filled with a sweet custard or cream. The éclair is then often topped with a layer of chocolate icing or fondant. While the croissant is indeed a flaky, crescent-shaped pastry that has a rich history often associated with Vienna and France, it is not known for being filled with custard. In contrast to the eclair, a croissant is characterized by its buttery layers, a muffin is a small, dome-shaped quick bread, and a donut is a sweet, typically ring-shaped or filled treat that is fried. Therefore, the correct answer to the question is (C) Eclair.