A and C are not sustainable routes for weight-loss or overall health.
for A, if you don’t eat those foods in your short-term diet, you likely won’t be receiving the right nutrition for a well-rounded diet. plus, once you quit your diet and live/eat normally once you reach your goal weight, you’ll gain weight back from consumption of these foods. the key is not to cut out foods, but to eat them in moderation.
for b, this is actually a healthy and long term friendly way to loose weight. therefore, it is not going to be one of your answers to this question.
for C, this is unhealthy behavior. so it serves as an answer to this questions.
for D, nutrient fence snacks are good for you because they provide a lot of nutrients! this is healthy behavior and the opposite of what this answer it looking for.
so A and C should be your answer.
let me know how it goes!