Which of the following sentences are appropriate with the word “attachment”?

A、I'm sending the document as an attachment. Please let me know if you have trouble reading it.
B、His attachment to classical principle was not so great as to deter him from practical innovation.

C、The service you get is fairly standard, with no apparent limits imposed on storage space or attachment size.
D、On the contrary she seemed rather to welcome Lesley-Jane's attachment.