Answer:
Micro Economics - 2 & 3 ; Macro Economics - 1
Explanation:
Micro Economics studies the behaviour of individual consumers, firms & industries. Eg : A good's demand.
Macro Economics studies the Economy as a whole. Eg : Aggregate Demand
2 & 3 : A consumer's optimal choice when buying a flat-screen TV , A firm's decision about the size of its new factory - are about a single consumer , a single firm. They are hence Micro Economics topics.
1 : The effects of government tax policy on long-term economic growth - is impact of macro economics topic 'budget' on entire economy's growth. They are hence Macro Economics topics.