The arithmetic mean of all odd positive numbers less than 100 will be

Option (a) is incorrect because 49.0 is not the arithmetic mean of all odd positive numbers less than 100.

Option (b) is incorrect because 49.5 is not the arithmetic mean of all odd positive numbers less than 100.

Option (d) is incorrect because 50.5 is not the arithmetic mean of all odd positive numbers less than 100.