Ammonia is a weak base because

it produces few hydroxide ions in water

it cannot hold on to its hydroxide ions

it is only slightly soluble in water

it is a dilute solution

I think it's the 1 st answer

Explanation:

Ammonia is a weak base because its nitrogen atom has an electron pair that readily accepts a proton. Also, when dissolved in water, ammonia acquires hydrogen ions from water to produce hydroxide and ammonium ions. It is the production of these hydroxide ions that imparts ammonia its characteristic basicity.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.