The correct option is A Arjan Dev
Among his three sons, Guru Ram Das chose his son Guru Arjan Dev to succeed him. He sidelined his other son Prithi Chand as he thought he was greedy. His other son, Mahadev had no interest in worldly affairs. Thus, Guru Arjan Dev Ji took the responsibility of leading the Sikhs after the demise of Guru Ram Das Ji in 1581.