In the diagram above, which of the angles \( \theta _1 \) , \( \theta _2 \) , \( \theta _3 \) and \( \theta _4 \) is the angle of deviation of the ray of light passing through the glass prism XYZ?

• A.\( \theta _3 \)
• B.\( \theta _2 \)
• C.\( \theta _1 \)
• D.\( \theta _4 \)
• E.