How similar are these two sentences, on a scale from 0-5 (0 is "not similar" and 5 is "very similar")?

Two people sit on the end of a dock.
Two people sitting on a dock.

Choose from:
 A). 0;
 B). 1;
 C). 2;
 D). 3;
 E). 4;
 F). 5;
E).