Concept:The sentence needs a logical sequence where adjectives, nouns, and verbs fit grammatically.
Explanation:The first blank must be a noun because "Archaeological" is an adjective.
Word (C) "investigations" is a noun and fits here.
The second blank needs a verb to state what the investigations did.
Word (A) "determined" is a verb and works here.
The third blank requires an adverb to describe the time estimate.
Word (B) "probably" is an adverb and fits correctly.
Thus the correct order is C, A, B.
Answer:Option D – CAB