The correct answer is option 3 - 1, 2 and 3 are all correct statements.

Let`s analyze each statement:

1. The International Date Line is drawn zig-zag to avoid landmass: This statement is true. The International Date Line is not a straight line but rather a zig-zag line that deviates from the meridian by about 1,000 km on certain points in order to avoid dividing countries or landmasses. This ensures that each country in the Pacific region falls within the same calendar day.

2. The International Date Line is 180° W as well as 180° E of Greenwich: This statement is true. The line is located at approximately 180 degrees of longitude both to the east and west of the Prime Meridian (which passes through Greenwich, England). It is at this point that the calendar day changes.

3. A ship sailing westward from Greenwich when crossing the International Date Line would put back the date by a day: This statement is also true. When crossing the International Date Line from east to west, the ship would jump back a whole day. For example, if it is Monday on the eastern side of the line and the ship crosses it, it would become Sunday on the western side. This