Step 1: Read the stem.
We need the personality label that goes with a depression-prone nature. Think of the letter classification as a quick lookup of health risk.
Step 2: Match a risk to each letter.
A goes with the heart, B with good health, C with suppressed anger and cancer risk, and D with distress and low mood.
Step 3: Why Type A fails.
A hard-driving, time-pressed style raises blood pressure and heart trouble. Depression is not its signature. Option 1 is out.
Step 4: Why Type B fails.
A calm and unhurried style protects health. It cannot be called depression prone. Option 2 is out.
Step 5: Why Type C is weaker.
Type C is about patience, pleasing others and bottling up feelings, with cancer as the usual link. Depression is not its main label. Option 3 is not chosen.
Step 6: Why Type D fits.
The D stands for distressed. Constant worry, gloom and social holding back make a person prone to depression. Option 4 matches.
Final Answer:
Using the letter-to-risk lookup, depression belongs to the distressed Type D, which is option 4.\[ \boxed{\text{Type-D personality}} \]