That he published his first novel at such a young agesurprised his family and friends. The underlined part is an example of -

• That he published his first novel at such a young age surprised his family and friends. The underlined part is an example of - noun clause.
- যেহেতু অপশনে noun clause নেই, তাই সঠিক উত্তর হবে - None of these.

• Noun clause:
- A noun clause is a group of words that band together and act like a noun. They're always dependent clauses.

• একটি বাক্যের চারটি স্থানে Noun clause  বসতে পারে -
1. subject হিসাবে 
2. transitive verb এর object হিসেবে
3. Linking verb এরপরে complement হিসাবে 
4. Preposition এরপরে

• প্রশ্ন প্রদত্ত বাক্যে "That he published his first novel at such a young age" clause টি  subject হিসাবে বসেছে, তাই এটি Noun clause.