Consider the following countries
Which among the above are Nuclear Weapons States as recognized by the Treaty on the Nonproliferation of Nuclear Weapons, commonly known as Nuclear Non-Proliferation Treaty (NPT)?(2015)
a) 1 and 2 only
b) 1, 3, 4 and 5 only
c) 2, 4 and 5 only
d) 1, 2, 3, 4 and 5
The treaty recognizes five states as nuclear-weapon states: the United States, Russia, the United Kingdom, France, and China (also the five permanent members of the United Nations Security Council).
Four other states are known or believed to possess nuclear weapons: India, Pakistan and North Korea have openly tested and declared that they possess nuclear weapons, while Israel has had a policy of opacity regarding its nuclear weapons program.
So, you can conclude that Israel can never be a part of the answer which directly points out to option A as the answer.