Sunlight heating the sand on the beach on a hot summer day is an example of a. conduction
b. convection
c. radiation
d. none of these

The answer to this is C. i hope this helps

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.