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So what is the correct form of verb should be used here?

The much unkown land has the largest hoard of metals and minerals in the world. The latest scientific findings confirm/ confirmed/have confirmed the inexhaustible sources of copper, coal, uranium and many other ores. The six-winter month of polar darkness is lighted up by large batteries of light. Scientists have found that the Antartic climate is probably the most healthy climate in the world, for the intense cold of thousands of years has sterilized this continent and rendered it absolutely germ-free.
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Since the latest scientific findings may date to ten years ago, all three are gramatical and logical. You could even add, "continue to confirm," "will confirm," etc.
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Hi,

A small comment.

There are a couple of phrases in this paragraph that make me doubt that it was written by a native speaker.

The much unknown land. Lighted up by large batteries of light.

Best wishes, Clive
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Comments  
Kins_10
So what is the correct form of verb should be used here?

The much unkown land has the largest hoard of metals and minerals in the world. The latest scientific findings confirm/ confirmed/have confirmed the inexhaustible sources of copper, coal, uranium and many other ores. The six-winter month of polar darkness is lighted up by large batteries of light. Scientists have found that the Antartic climate is probably the most healthy climate in the world, for the intense cold of thousands of years has sterilized this continent and rendered it absolutely germ-free.

I asked this because it is a multiple-choice-question from a workbook. All the verbs in the text are in the present form. The answers given are

A. confirm

B. confirmed

C. confirming

It's rather confusing for me.

D. have confirmed
 Clive's reply was promoted to an answer.
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