Who wants brainliest?

Select the sentence that is correctly written.

AYesterday, after I lay my bookbag on the table, I lay on the couch.
BYesterday, after I lay my bookbag on the table, I laid on the couch.
CYesterday, after I laid my bookbag on the table, I lay on the couch.
DYesterday, after I laid my bookbag on the table, I laid on the couch.

It would be great if it could also be explained why the chosen sentence is correct. Thanks.