Action and reaction:- (For a given system)
(a) Act on the two different objects
(b) Have opposite directions
(c) zero resultant

Options

A. a,b,c
B. b,c,d
C. All of the above
D. None of the above

Explanation

To analyze the statements regarding action and reaction pairs, let's break down the concepts step by step.

### Step 1: Understanding Action and Reaction Pairs
According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. This means that forces always come in pairs.

### Step 2: Evaluating Each Statement
Now, let's evaluate the three statements provided in the question:

**(a) Act on two different objects:**
This statement is true. Action and reaction forces act on two different objects. For example, if object A exerts a force on object B, then object B exerts an equal and opposite force on object A.

**(b) Have opposite directions:**
This statement is also true. The forces in an action-reaction pair always act in opposite directions. If object A pushes object B to the right, then object B pushes back on object A to the left with an equal force.

**(c) Zero resultant:**
This statement is true as well. When considering a system where only internal forces (action-reaction pairs) are acting, the net force is zero. This means that the forces cancel each other out, resulting in no net external force acting on the system.

### Conclusion
All three statements (a), (b), and (c) are correct regarding action and reaction pairs.

### Final Answer
- (a) Act on two different objects: True
- (b) Have opposite directions: True
- (c) Zero resultant: True