The correct answer is A. 15342.
Sudhir donated 15 million rupees. This can be written in words as fifteen million rupees. It can also be written in numerals as 15,000,000.
The other options are incorrect because they do not represent the correct amount of money that Sudhir donated.
Option B, 15423, is incorrect because it is missing a digit. The correct amount of money that Sudhir donated is 15 million rupees, which is written as 15,000,000.
Option C, 12354, is incorrect because it is too low. The correct amount of money that Sudhir donated is 15 million rupees, which is written as 15,000,000.
Option D, 12345, is incorrect because it is too low. The correct amount of money that Sudhir donated is 15 million rupees, which is written as 15,000,000.