Question

More than 300 rivers drain into Siberia's Lake Baikal, which holds 20% of the world's fresh water, more than all the North American Great Lakes combined.

A. More than 300 rivers drain into Siberia's Lake Baikal, which holds 20% of the world's fresh water, more than all the North American Great Lakes combined.
B. With 20% of the world's fresh water, that is more than all the North American Great Lakes combined, Siberia's Lake Baikal has more than 300 rivers that drain into it.
C. Siberia's Lake Baikal, with more than 300 rivers draining into it, it holds more of the world's fresh water than all that of the North American Great Lakes combined, 20%.
D. While more than 300 rivers drain into it, Siberia's Lake Baikal holds 20% of the world's fresh water, which is more than all the North American Great Lakes combined.
E. More than all the North American Great Lakes combined, Siberia's Lake Baikal, with more than 300 rivers draining into it, holds 20% of the world's fresh water.

Answer 1

A. More than 300 rivers drain into Siberia's Lake Baikal, which holds 20% of the world's fresh water, more than all the North American Great Lakes combined.

Step-by-step explanation:

The option B is incorrect because it has the preposition "With" which mess the whole statement

The option C is incorrect because the pronoun "It" before "holds" is not necessary

Option D is incorrect because the word "while" makes the sentence incoherent.

Option E is incorrect because it appears like the statement is making a comparison between baikal with more than all the North American great lakes.

Hence, the correct answer is option A.