Question

you are a lair this is known to all change into one complex sentence by using a noun clause​

Answer 1

Explanation:

it is known to all that you are a liar

Answer 2

Answer:

A Complex Sentence consists of one principal clause and any number of subordinate clauses.

A Noun Clause is a subordinate clause which does the work of a noun in a complex sentence.

In this case,

Explanation:

Option D is correct. The subordinate clause what you say acts as the object of the preposition in, in the principal clause. The object is always either a noun or a pronoun and as the subordinate clause in this sentence behaves as a noun, it is considered as a subordinate noun clause.

Option A is incorrect as an adverb clause has been used to combine the two sentences.

Option B is incorrect because it is a simple sentence.

Option C is incorrect as the subordinate clause behaves as an adjective clause.