The correct answer for this question is option 4, which is "1 and 2 only".

Let`s dissect each option to understand why option 4 is correct:

Option 1: "1 and 3 only" states that the Government of India Act, 1919 established a bicameral legislature at the Centre and introduced a federal system of government in India. However, this is incorrect. The Act did not introduce a federal system of government. Therefore, option 1 is incorrect.

Option 2: "2 and 3 only" states that the Government of India Act, 1919 introduced dyarchy in the provincial executive and introduced a federal system of government in India. As discussed earlier, the Act did not introduce a federal system of government. Therefore, option 2 is incorrect.

Option 3: "1, 2, and 3" states that the Government of India Act, 1919 established a bicameral legislature at the Centre, introduced dyarchy in the provincial executive, and introduced a federal system of government in India. Again, as mentioned earlier, the Act did not introduce a federal system of government. Therefore, option 3 is incorrect.

Option 4: "1 and 2 only" states that the Government