Answer:
It's called "Great conjunction"
I believe it is D because it is giving data about the garlic while the other answers are observations of the garlic
A. Ammonium = polyatomic ion
B. Oxygen = compound
C. Silver = element
D. Nitrate = polyatomic ion
E. Helium = element
F. Water = polyatomic ion
G. Nitrogen = element
H. Carbon dioxide = compound
Catalyst increases the rate of a chemical reaction