Who was the first man to create a paper

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.

not concrete, existing in thought or as an idea but not having a physical or concrete existence

the answer is a hoped this

the answer is c because info security should not use them for code