<span>if these are the choices
A. This is his.
B. Whose is this?
C. Which one is this?
D. This hat is his.
then it is d</span>
This sentence is a simple sentence, because it contains only one predicate, which is <em>was.
</em>Although you can see another verb here (born), it is not a predicate, but an adjective, which makes this sentence a simple one. <em>
</em>
One drawback of voluntary trade is that it can make one group dependent upon another for necessary goods.