After constructing a binary serach tree from the following integers

$50,15,62,5,20,58,91,3,8,37,60,24$

The number of the node in the left sub$-$tree and right sub$-$tree is$?$

Select one:

a$.$ left $=9$ right $=2$

b$.$ left $=8,$ right $=3$

c$.$ left $=7$ right $=4$

d$.$ left $=6$ right $=5$