GMAT Critical Reasoning (CR) | Re: Although the earliest surviving Greek inscriptions written

let us read the paragraph provided -

the first sentence - "although the earliest surviving ....,a strong case can be made that the Greeks actually adopted alphabetic writing at least two centuries earlier. " - talks about the author's opinion.

In fact, the highlighted portion serves as the mainconclusion of the argument.

Let us read the rest of the paragraph. The next sentence states a fact.

the next clause (3rd sentence) - " Now the Greeks learned alphabetic writing from the Phoenicians
...

---