$\"\"$

The diffrential equation is $\"\"$ .

(1).Draw the coordinate plane.

(2).Graph the diffrential equation $\"\"$ .

Graph :

$\"\"$

Observe the graph :

The diffrential equation $\"\"$ represents the graph $\"\"$ .

Explanation :

At $\"\"$ field lines are horizantal at $\"\"$ .

The only graph that satisfies these two conditions is garph $\"\"$ .

$\"\"$

The correct choice is $\"\"$ .