We see that the mirror line is used horiziontally. So the reflections of the figure will be:

1. - The arrow will change from up right to up left.

- The black circle will move from left to right.

- The with circle and blue circle will move from right to left.

=> The answer is b.

2. - The white square will move from left to right.

- The big blue square and big black square will move from right to left.

- The small blue square and small black square will move from left to right.

=> The answer is d.

3. - The arrow to right will change to left.

- The start from the left will change to right.

=> The answer is e.

4. - The rhombus will move from right to left.

- The big shape will move from left to right.

=> The answer is c.

5. - The L move from first right to first left.

 - The circle move from second right to second left.

- The square painted black on the top will stay the position.

- The square painted black on the left will turn to painted black on the right and move from second left to second roght.

- The tree shape will move from first left to first right.

=> The answer is a.