Correct Answer: Boost

Solution : The correct choice is the third option.

Promote means to help or encourage the advancement, growth, or development of something. Boost is a synonym for "promote" and implies increasing or enhancing something, typically by providing support or encouragement to further its progress.

The meanings of other options are as follows:

• Discourage: This means to dissuade or persuade someone not to do something; to reduce confidence or enthusiasm in someone or something.
• Delay: This means to postpone or make something happen at a later time than originally planned; to cause something to take longer than expected.
• Block: This means to obstruct or prevent movement or progress; to hinder or stop something from happening or progressing.