Explanation

Option A is correct: The Industrial Revolution in Britain led to the severe deindustrialization of India. Influx of cheap, machine-made cotton textiles from Manchester and Lancashire, combined with unilateral free-trade policies and heavy duties on Indian goods entering Britain, devastated the traditional Indian weaving, spinning, and cottage handicraft industries.

– Option B is incorrect: Modern mechanized textile mills in India were not introduced in large numbers in the first half of the 19th century; the first successful commercial cotton mill was founded in Bombay by Cowasjee Nanabhoy Davar in 1854.
– Option C is incorrect: Indian railways were initiated only in 1853 (the inaugural line between Bombay and Thane) and expanded primarily during the second half of the 19th century.
– Option D is incorrect: British colonial policies imposed one-way free trade on India, admitting British factory goods duty-free or with minimal protective levies while taxing Indian artisan exports abroad.

Hence, the correct answer is Option A.