Correct Option (a):
Statement 1 is correct. The total land area of Earth is approximately 148.3 million square kilometers, which is equivalent to 1483 lakh square kilometers. Therefore, 1475 lakh square kilometers is a reasonable approximation.
Statement 3 is correct. The Pacific Ocean is the largest and deepest of Earth's oceanic divisions. It contains the maximum volume of Earth's ocean water, covering over 165 million square kilometers.
Incorrect Options:
Statement 2 is incorrect. The approximate ratio of land area to water area on Earth is about 1:2.43, meaning approximately 29% of the Earth's surface is land and 71% is water. A ratio of 1:4 would imply a significantly lower percentage of land (20%), which is factually inaccurate.
Options (b), (c), and (d) are incorrect. Option (b) is incorrect because Statement 2 is false. Options (c) and (d) are incomplete as they do not include both Statement 1 and Statement 3, both of which are correct.