Question

which sentence includes a noun clause?
how do you do?
he is the boy who is cool.
that she won the game was surprising.
i like it because it is nice to watch.

Explanation:

Para identificar la oración con una cláusula nominal, debemos recordar que una cláusula nominal funciona como sujeto, objeto o complemento y suele ser introducida por palabras como "that" (cuando no tiene función gramatical dentro de la cláusula). Analicemos cada opción:

• "How do you do?": No tiene cláusula nominal.
• "He is the boy who is cool.": Tiene una cláusula relativa ("who is cool"), no nominal.
• "That she won the game was surprising.": La parte "That she won the game" es una cláusula nominal que funciona como sujeto de la oración. Aquí, "that" introduce la cláusula nominal sin tener función dentro de ella, y la cláusula "she won the game" actúa como sujeto de "was surprising".
• "I like it because it is nice to watch.": Tiene una cláusula adverbial de razón ("because it is nice to watch"), no nominal.

Answer:

That she won the game was surprising. (La oración "That she won the game was surprising" incluye la cláusula nominal "That she won the game" que funciona como sujeto de la oración principal.)