When two D.C. series motors are connected in parallel, the resultant speed is

The correct answer is: A. More than the normal speed.

When two D.C. series motors are connected in parallel, the resultant speed is more than the normal speed. This is because the two motors will share the load equally, and each motor will have a higher current than it would if it were connected alone. The higher current will cause the motor to speed up.

Option B is incorrect because the resultant speed is not less than the normal speed. Option C is incorrect because the resultant speed is not the same as the normal speed. Option D is incorrect because the resultant speed is not zero.