Call back; Call somebody back

Let's read very carefully some sentences:

1- I'm afraid Lady larissa is in a meeting. Can you call back later?
2- There's a phone message for you: Can you call teacher J.B. back this evening?
3- I left lots of messages for Angelina Jolie, but she never called me back.
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The sentences above will help you with the exercises below:

1- Read carefully the sentences below. Two of them are correct explanations of the meaning of this phrasal verb. Tell me the wrong definition.

A) To telephone somebody again.
B) To telephone somebody.
C) to telephone somebody who telephoned you earlier.

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2- Which of these are gramatically possible?

a) I called back later.
b) I called my parents back later.
c) I called back my parents later.
d) I called them back later.
e) I called back them later.

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3- It's time for me to know if you really understood the correct way of using call back or call somebody back. Complete the sentences below according to the needs:

a) Emily wasn't in when I phoned the first time,  so I ................................................................
b) I'm rather busy at the moment,Waldo. Can I.......................................................................?
c) I left a message with his secretary and he ............................................................................
d) I've phoned her three times today, but she ..........................................................................

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Extra information:

There is a noun in English called callback. This noun has two meanings. It can be a device in a telephone that automatically calls again the number that you tried to call ,  but it was busy at that moment. Or it can be a telephone call that you make to somebody who has called you earlier. In this case you can use it after the verb " give".

** Alex is really busy now. So please leave your number and he will give you a callback as soon as he can.