C

Step 1: Determine the angle between the two mirrors. The angle is the sum of the angles of the mirrors: 22° + 50° = 72°.
Step 2: Use the formula for calculating the number of images formed between two mirrors: \( k = \left( \frac{360}{\theta} \right) - 1 \), where \( \theta \) is the angle between the mirrors.
Step 3: Substitute \( \theta = 72° \) into the formula:
\( k = \left( \frac{360}{72} \right) - 1 = 5 - 1 = 4. \)
Therefore, the number of images formed is 4, and the correct option is C.