Which of the following compounds will show geometrical isomerism?

1.   2-butene

2.   propene

3.   1-phenylpropene

4.   2-methylbut-2-ene

(a) 1, 2

(b) 3, 4

(c) 1, 2, 3

(d) 1, 3

[IIT, 1998]