Delilah lost her husband Hendricks in a highway accident. Being just 3 years into marriage, she was devastated. 4 months later, she was hassled by problems such as intrusive thoughts, flashbacks, nightmares, sleep disturbance, and problems in concentrating. Delilah is probably experiencing _________.

a. post-traumatic stress disorder symptoms
b. restoration-oriented stress
c. disenfranchised grief
d. separation anxiety