the picture in the attached figure
we know that
perimeter of a triangle=(2t)+(2t+2)+(2t+4)
perimeter of a triangle=36 units
so
36=(2t)+(2t+2)+(2t+4)
6t+6=36
6t=36-6
6t=30
t=5
therefore
the length of each side is
2t=2*5-------> 10 units
2t+2=2*5+2-----> 12 units
2t+4=2*5+4-----> 14 units
the answer is the option D
12 units, 14 units, 10 units