Are these sentences right?

Question

Are these awkward? I don't know the difference between 'in connection with' 'in regard to' ' in reference to'.

1. She is calling in connection with an order she placed for a computer.

2. She is calling in regard to an order she placed for a computer.

3. She is calling in reference to an order she placed for a computer.

Answer 1

The second one makes the most sense.

It would probably be better to say 'she is calling regarding an order she placed for a computer', though.

......

In regard to means about, Eg. 'She is calling about'. In reference to means referring to, which doesn't really make sense in this context. In connection to means related to, which again doesn't really make sense like this.  

Answer 2

2 and 3 sound and look just fine

1 sounds weird

Answer 3

They are all a bit long-winded, but correct, and mean the same.

'With' reference is more correct than 'in' reference, though.

'She is calling about the order she placed for a computer' is just as effective, and

'She is calling about her computer order' even shorter.