In Hindi, 'Palak' (पलक) means eyelash - the short hairs growing on the edge of the eyelid that protect the eye from dust and debris. This is a common vocabulary word in Hindi literature and everyday conversation. Option A (Space) is 'Antariksh', Option C (Joy) is 'Anand', and Option D (Pure) is 'Shuddh' or ' Pavitra'.