Unexplained weight loss why does it happen to people with undiagnosed cancer

One major reason for weight loss with undiagnosed cancer is called tumor induced weight-loss or cancer cachexia. This is when a tumor made up of cancer cells use energy and change how calories are stored and burned. Basically the tumor uses energy and burns more calories. This results in loss of appetite, which also contributes to the loss of weight as now there is even less for the cell to use.

out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.

true. these things define the personality of the person.