Let’s . . . . . . . . that old box. We don’t need it. A. throw up B. throw in C. throw away D. throw out

The correct answer is: throw away.

The other options are:

• throw up: to vomit
• throw in: to add something to a container or group
• throw out: to get rid of something by throwing it away

In this context, the best option is “throw away” because it means to get rid of something by throwing it in a trash can or dumpster. The other options do not make sense in this context.