Which of the following is true of an organ? a. an organ is the oldest keyboard instrument. b. organs are all electronic. c. organs must have large pipes. d. organs have limited range of sound.

It's A because B is wrong, they are not all electronic. C is wrong, there are electric organs, steam organs and more. And D... really? They don't

500

Step-by-step explanation:

- Round the number up to the nearest hundred if the last two digits in the number are 50 or above.  

- Round the number down to the nearest hundred if the last two digits in the number are 49 or below.

- If the last two digits are 00, then we do not have to do any rounding, because it is already to the hundred.