The orbits of lie closer to the sun than does earth's orbit.

Mercury and Venus lie closer to Sun than position of Earth

Explanation:

As we know that all planets around the sun in the range of their distance can be arranged as following:

1). Mercury.

2). Venus.

3). Earth.

4). Mars.

5). Jupiter.

6). Saturn.

7). Uranus.

8). Neptune.

Since Earth lie at 3rd position from sun so two closer planets are Mercury and Venus

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

not too sure thinking all accelerations are pointed down