How can we simply connect AC generator into DC generator:
A. by replacing the magnetic parts by electromagnets.
B. by replacing the slip rings of the AC generator with commutators.
C. by making the AC generator rotate faster.
D. A and C

Hint: The alteration of energy takes place in an Alternating current alternator by electromagnetic induction. Electromagnetically induced emf occurs in the Direct current alternator, which entirely depends upon armature rotation to convert energy. Emf is induced in both AC and DC generators.

Complete step by step answer:
We know that in the AC scenario, the current diverts its direction according to the loop, and after the 180-degree turn of the loop, the polarity reverses, and the direction of the current is changed. But in the commutator scenario, the commutator is connected to the brush components. Even if the polarity changes after a 180-degree turn, the brushes are connected, and the combined effect cancels out. The current direction remains in the same direction as before.
We have studied that the AC generator has slip rings and the DC generator has a commutator. We can substitute the AC generator's slip rings by the commutator to connect the AC generator to the DC generator.
Therefore, we can connect AC generators with DC generators by substituting the slip rings with the commutator.

So, the correct answer is “Option B”.

Note:
The wear rate of slip rings is relatively low, and hence they work for a longer duration, and therefore, the slip rings are highly efficient. But in the case of commutators and the brushes, the wear rate is relatively high, and they don't work for a long duration and thus are inefficient.