Option 1: B Complex - B vitamins are water-soluble, meaning they are not stored in the body and any excess is excreted in urine. Therefore, taking them in excess is generally not dangerous.

Option 2: E and C - Both vitamin E and C are water-soluble vitamins, which means they are not stored in the body. Taking them in excess is usually not dangerous, as any extra amounts are eliminated through urine.

Option 3: B and C - We`ve already discussed that B vitamins are not stored in the body. Vitamin C is also water-soluble and is not typically stored, so taking them in excess is generally not harmful.

Option 4: A and D - This is the correct answer. Vitamin A and D are fat-soluble vitamins, which means they can be stored in the body. Taking excessive amounts of these vitamins can lead to toxicity and adverse health effects.

In conclusion, option 4 is the correct answer as vitamin A and D are the vitamins that can be dangerous if taken in excess because they are stored in the body.