What do the symbols in parenthesis indicate?

Question

C7H16 (l) + 11O2 (g)
7CO2 (g) + 8H2O (l)
A.
the physical state of each reactant and product
B.
the catalyst used in the reaction
C.
the number of atoms of each reactant and product
D.
the unit of reactant and product
E.
the rate of the chemical reaction

Answer 1

The symbols in parentheses indicate:

A. the physical state of each reactant and product

In the given chemical equation, (l) denotes a liquid state, and (g) denotes a gaseous state.