Hi @alberthong88 - thanks for bringing that to our attention, we’ve revised the start date of construction in the chart. It previously inadvertently listed 2021 as the year, when it should have been 2022.
The question was technically correct previously even given this error - the question is asking ‘what’s the error in the schedule’ and gives 4 choices, of which only one is an error. The question isn’t asking ‘what is the biggest error’.