In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each number.
The last mammoths, who were very large elephant-like animals, lived as recently as 4,000 years ago. ________ (1) their well-preserved bodies can be ________ (2) frozen in the tundra of Siberia. Because _______ (3) bodies were so well protected from decay ________ (4) the permafrost, their genetic material remained intact. ________ (5) at Harvard University are researching ways to bring the mammoth back to life.
Select the most appropriate option of fill in blank No. 1.

Options

A. So
B. But
C. And
D. Because

Answer

B

Explanation

But