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: Google plans to begin delivering packages by drone in 2017, the firm has revealed. It is set to face fierce competition from Amazon, Wal-Mart and others, all of whom are developing competing systems. 'Our goal is to have commercial business up and running in 2017,' David Vos, the project lead for Google's Project Wing, told an audience at an air traffic control convention outside Washington. The FAA currently bans commercial drone flights except for a few dozen companies that have been granted waivers. That ban will stay in place until regulations become final, but FAA officials plan to continue granting waivers case by case.Project Wing's prototype aircraft have a wingspan of approximately 1.5m (4.9ft) and have four electrically-driven propellersGoogle set to face fierce competition from Amazon, Wal-Mart and othersSee the latest Google news and product launches 
 Question:The move is the clearest sign yet it plans to go head-to-head with _ in.

Amazon