Answer:
a. Sales promotions have increased because of competition in emerging markets.
Step-by-step explanation:
Competition in emerging markets is irrelevant for sales promotions. If you are present in a particular market, competition in other markets won't affect the efficiency of your sales promotions.
On the other hand, other statements are correct. Sales promotions are a great tool to hinder consumer price resistance, as they emphasize the benefits of the product and make the whole promotion more convincing.
Technology upgrades vastly affect and improve sales promotions (use of AR/VR in promotions, media, AI...). The wider market of ad agencies gives companies a better choice (with a more competitive price) of agencies that will conduct the sales promotions.