When Viewed from Earth, Venus Subtends an Angle of About

Multiple Choice

When viewed from Earth, Venus subtends an angle of about 1 arcminute (1/60°) when it is at the closest point to Earth in its orbit. If we are watching Venus set in the west over a clear horizon (e.g., ocean) , how long would Venus take from the time it first reached the horizon to completely disappear below the horizon?

A) almost instantaneous (much less than 1 second)
B) 1 second
C) about 4 minutes
D) about 4 seconds