Match List I with List II:

List I	List II
[A] Salim Ali	[I] Wild beauty
[B] Jim Corbett	[II] The fall of a sparrow
[C] Kailash Sankhala	[III] Night and days: my book of Indian wildlife
[D] M. Krishnan	[IV] My India

The correct option is (A)-(II), (B)-(IV), (C)-(I), (D)-(III).

Let us understand the correct matching of each conservationist/environmentalist in List I with their corresponding literary work or contribution in List II:

[A] Salim Ali matches with [II] The fall of a sparrow:
Sálim Ali was a world-renowned Indian ornithologist and naturalist, often referred to as the "Birdman of India". "The Fall of a Sparrow" is his celebrated autobiography, which details his life, his passion for birds, and his journey in ornithology.

[B] Jim Corbett matches with [IV] My India:
Jim Corbett was a legendary British-Indian hunter, tracker, naturalist, and author who played a key role in establishing India's first national park. "My India" is one of his famous books, published in 1952, containing stories about the people of rural India whom he deeply respected and loved.

[C] Kailash Sankhala matches with [I] Wild beauty:
Kailash Sankhala was an eminent Indian biologist and conservationist, famously known as the "Tiger Man of India". He was the first director of Project Tiger, and "Wild Beauty" is one of his noted publications showcasing the beauty and preservation of Indian wildlife.

[D] M. Krishnan matches with [III] Night and days: my book of Indian wildlife:
Madhaviah Krishnan was a pioneering Indian naturalist, photographer, and writer. "Nights and Days: My Book of Indian Wildlife" is a compilation of his insightful columns, writings, and observations on Indian nature and fauna.

Thus, by aligning each personality with their respective work, we get:
A - II
B - IV
C - I
D - III