I lost my pen I bought yesterday

Dear native English speakers,
would these sentences sound right?
(a) I lost my pen I bought yesterday.
(b) I lost my pen that I bought yesterday.
(c) I lost my pen which I bought yesterday.

Should "the" be used instead of "my"?
I guess (c) would not be used in the US.

How about "a", instead?
(d) I lost a pen I bought yesterday.
(e) I lost a pen that I bought yesterday.
(f) I lost a pen which I bought yesterday.

Thanks in advance.

Hirashin

hirashin said:

Should "the" be used instead of "my"?

Click to expand...

Use the instead of my in all of them--then they're okay.

It wouldn't be my word choice, but (c) is okay with me.

Thanks for the help, johnnyG. いつもありがとうございます。