Multi-choice problem: Continue writing the next sentence in this paragraph:

How to travel with mental illness
Know that travel may exacerbate pre-existing mental health conditions.
Travel can be stressful by itself, and the stress of physical, emotional, and social changes can affect pre-existing emotional disorders. Before you make travel plans, know that conditions can reappear or become exacerbated with travel.

Available options:
(a). Signs of pre-existing mental health include increased anxiety, exposure to dangerous and intimidating conditions, dark dreams, having difficulty sleeping, or avoiding negative situations. Beliefs and beliefs may continue even after you make your trip.;
(b). Factors to watch out for include dangerous driving, unsanitary conditions, substance abuse or disease, unsafe measures that can cause mental illness, and a vulnerable lifestyle. Consider visiting your doctor if mental health symptoms occur.;
(c). It's also possible for people pre-disposed to certain disorders (such as having a strong genetic link) to experience the emergence of a disorder while traveling. Be aware of your family history and personal history before planning a trip.;
(d). These conditions can include : Obesity emotional stress stress physical disease chronic illnesses metabolic disorders psychological disorders exposure to the world Try to identify the causes of physical illness. Studies have been made on how to identify symptoms of psychiatric disorders.;
(c).