This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to keep a newborn warm in winter
Dress your newborn in 1 more layer than you are wearing.
A good rule of thumb for dressing your newborn is to place them in 1 more layer than you are wearing. For example, if you are comfortable wearing a long sleeve shirt, then your newborn will probably need a long sleeved shirt and a cardigan.

Options: a). If your newborn is older, wearing a long sleeved shirt will not be necessary, but allow them some extra warmth if it gets wet. Alternatively, you can apply an additional layer on your newborn if they are really cold.. b). If you are wearing a sweater, then a long sleeve sweater will be good. This way you can easily move your newborn's clothing around.. c). If you do not have any layers in your closet, consider making several additional layers to place your newborn in each layer. For example, if you have no layers in your closet, then you will only need 1 more layer to layer your newborn.. d). Dress your newborn in warm clothes and outerwear for going outside. It is best to avoid taking your newborn outdoors in winter as much as possible..
The answer is:
d).