The correct answer is: Only I and II are implicit.
The statement “Television X – the neighbour’s envy, the owner’s pride” is an advertisement for a television. The advertisement is trying to persuade people to buy the television by suggesting that it is a superior product that will make people envious of the owner.
Assumption I is that catchy slogans appeal to people. This is a reasonable assumption, as catchy slogans are often used in advertising to make products more memorable.
Assumption II is that people are envious of their neighbours superior possessions. This is also a reasonable assumption, as envy is a common human emotion.
Assumption III is that people want to be envied by their neighbours. This is a less reasonable assumption, as not everyone wants to be the center of attention or to be envied by others.
Therefore, only assumptions I and II are implicit in the statement.