Which of the following is true about hygroscopic substances
a. they have low vapor pressures
b. they remove moisture from the air
c. they can be used as drying agents
d. all of the above

B is fasho the answer thank me later, It's not C because it can be used as a drying agent but not all hygroscopic substances are Drying agents and It also can be A

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