Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: It can’t receive phone calls, track your exercise or let you send messages, but an old watch made by Apple is on sale via eBay for more than the brand’s latest offering. An analogue promotional watch from Apple with a blue bezel, rubber strap and colourful hands, is listed on the internet auction site with a ‘buy it now’ price of $2,499.99 (£1,707.47) plus postage. For the same price as the 1997 timepiece, Apple fans could pre-order five of the cheapest Apple Watch Sport, which cost £299 in the UK and still have some change. An analogue promotional watch from Apple (pictured) with a blue bezel, rubber strap and colourful hands, is listed on the internet auction site with a ‘buy it now’ price of $2,499.99 (£1,707.47) plus postageAnalogue watch was released in 1997 to promote Apple's Mac OSHas a circular face and colourful hands, unlike Apple's modern WatchVintage timepiece is listed for $2,500 (£1,707) on eBayShoppers could buy five of the new Apple Watch Sports for less cash 
 Question:The seller, called ‘theappleipodbay’ calls the watch, which was released to promote Apple’s _, a ‘rare collector item.

Mac OS