Step 1: A neutral hydrogen atom has atomic number 1, so it has 1 proton and 1 electron.
Step 2: The ion H+ is formed when the neutral hydrogen atom loses its only electron, leaving behind just the nucleus, which is a single proton.
Step 3: Since the one electron the atom had has been completely removed, H+ has zero electrons remaining, it is essentially a bare proton.
Step 4: Hence the number of electrons in H+ is 0, option A.