Examine the shape of the shoreline of Red Sea. Which of the following set of observations offers the best evidence that the northeast (right-hand) and southwest (left-hand) shores of the Red Sea were once joined to each other?
a) the jigsaw-puzzle-like fit of the shorelines with each other, old rocks on the northeast shore, and young rocks on the southwest shore.
b) the jigsaw-puzzle-like fit of the shorelines with each other, and rocks of similar age on opposite shores of the Red Sea.
c) the varying width of the sea, old rocks on the northeast shore, and young rocks on the southwest shore.
d) the varying width of the sea, and rocks of similar age on opposite shores of the Red Sea.

The jigsaw-puzzle-like fit of the shorelines with each other, and rocks of similar age on opposite shores of the Red Sea offers the best evidence that the northeast and southwest shores of the Red Sea were once joined to each other.

Explanation:

The evidence of the continental drift theory is found along numerous sea coasts present in the world.

The Red Sea also exhibits the proof that the continental drift theory is true by displaying similar attributes that can be matched between the opposite coasts of the coastline.
The similarity in the physical characteristics simply conveys that the coasts were once a single piece of land.