Answer: 1056 in.
Step-by-step explanation:
It's simple, really. all you have to do is add 478 and 578, since the plant's height is 478, and it grew 578 inches. and 478 + 578 = 1056. so now, the plant is 1056 inches tall. I don't know why the answer is not in your list of answers, but i confirmed that it is 1056 in.
