The first answer is right.. the rest? Well, they are wrong...
One hundredth is 0.01, so the hundredth place is the second decimal place. 16.352 to two decimal places is 16.35, as the 2 is the third decimal place rounds down.
5.9952 To round that to the nearest hundredth (hundredth is the second number after the decimal) you have to look at the 3rd number and see if it is 5 or greater, or lower than 5. If it is higher than 5, round up and so the number would turn into 6. 6.00 is the correct answer.