The picture below shows an asteroid and a comet. Asteroid
Comet
Source: htto://www. nasa. govlworldbook/asteroid word ook him (asterold)
Source: htto/www. nasa. gov/worldbook/comet worldbook html (comet)
Which of these statements best describes the difference between asteroids and comets?
(3 points)
O Asteroids are composed of metals and gases: comets are composed of metals and rocky
material.
O Asteroids are composed of ice and gases; comets are composed of ice and metals,
O Asteroids are composed of rocks and frozen gases; comets are composed of metals and rocky
material.
Asteroids are composed of rocky material and metals: comets are composed of ice and rocky
material.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

i'm assuming that the correct answer is indeed the first one/ "a"..

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.