Vector Subtraction via Parallelogram Rule

Steps:

• Identify R = Q - P as equivalent to Q + (-P), where -P reverses P's direction and keeps magnitude.
• Place tails of Q and -P at a common point to form a parallelogram.
• R is the diagonal from the common tail to the head of Q (or -P's head).
• Compare scaled diagram options to match this resultant vector.

Why C is correct:

• C shows the diagonal opposite to P in the Q and -P parallelogram, per vector addition law.

Why the others are wrong:

• A represents P - Q, reversing the subtraction.
• B shows P + Q, adding instead of subtracting.
• D depicts scalar difference, ignoring vector direction.

Final answer: C