Chelsea,a 22-Year-Old,is Addicted to Heroin

Chelsea,a 22-year-old,is addicted to heroin.She frequently steals items to resell in order to get money to support her addiction.One day she takes her grandmother's $825 Social Security check and signs the grandmother's name on the back.She then gives the check to Freddie,her boyfriend,who agrees to try to cash it.At the bank the teller becomes suspicious of Freddie when he presents the check.The teller refuses to cash the check and summons the bank security guard.The guard detains Freddie until the police arrive.The most serious offense Chelsea has committed is:

A) theft because she took the check without the grandmother's effective consent.
B) forgery because she completed the check with intent to defraud the bank.
C) issuance of bad check because the check lacks a valid endorsement.
D) criminal simulation because she simulated her grandmother's signature.