Which of the following pairs of triangles cannot be similar by the SSS criterion?
a) Sides (4cm,6cm,8cm) and (6cm,9cm,12cm)
b) Sides (3cm,4cm,5cm) and (6cm,8cm,10cm)
c) Sides (4cm,6cm,8cm) and (6cm,9cm,13cm)
d) Sides (5cm,7cm,9cm) and (10cm,14cm,18cm)