Answer:
The correct option is I and II.
Explanation:
The two goods are substitutes when the price of one good increases the demand for other good increases.
Movies at theaters and movies at homes are substitutes in (I) since the higher price of theater movies causes an increase in demand for home movies.
However, movies at theaters and homes are complements in (II) as an increase in demand for one also causes an increases demand for the other.
Cross price elasticity of complementary goods, however is negative, so (III) is wrong.