A part of the following sentence is underlined. Choose the option which can replace the underlined part to improve the sentence. In case Options A, B and C are not found suitable, choose Option D: "No Improvement Required."
When scaling the Himalayas, the higher one ascends, the lesser oxygen is available.
Show answer & explanation
Correct answer: A
Explanation
The word "less" is the correct comparative form to use with the uncountable noun "oxygen", "lesser" is incorrect in this context.