The correct option is A Shri Guru Ram Das Ji
Guru Arjan Dev conceived the idea of creating a central place of worship for Sikhs and himself designed the architecture of Sri Harmnadir Sahib known as Golden temple. Earlier the planning to excavate the holy tank(Amrit Sarovar) was chalked out by Guru Amardas Sahib but it was executed and the foundation was laid by Guru Ram Das ji, the fourth Nanak.