Which of the following situations can be modeled by the expression -4 - 6?

a. before jana started her diet, she was six pounds over her target weight. now, three months later, she is four pounds under her target weight. what was her change in weight over the last three months?

b. last month jana started dieting and lost four pounds. this month, however, she gained six pounds back. what was her change in weight from when she started the diet until now?

c. last year, jana gained a total of six pounds. so far this year, she has lost a total of four pounds. what was her change in weight from the beginning of last year until now?

d. none of the above