The law is supposed to be enforced strictly in sensitive areas.

✅ Explanation:

Given sentence (Passive Voice):
👉 “The law is supposed to be enforced strictly in sensitive areas.”

🔍 Step-by-step conversion:

1. Identify structure:

   • is supposed to be enforced → modal-like passive structure

   • Pattern: Object + is supposed to be + V₃

2. Convert to Active Voice:
   👉 Subject (doer) + is supposed to + V₁ + object

3. Since doer is not mentioned, we use a general subject like:

   • people, authorities, officials, etc.

🔁 Conversion:

• Passive: The law is supposed to be enforced…

• Active: Authorities are supposed to enforce the law strictly in sensitive areas. ✔️

❌ Why others are incorrect:

• The law enforces itself… → illogical ❌

• It is supposed that someone… → incorrect structure ❌

• Strict enforcement… → still passive-like, not active ❌

📌 Extra Facts (Exam Tips):

1. “Supposed to” Rule:

   • Passive: is supposed to be done

   • Active: are supposed to do

2. When subject is missing:

   • Use general subjects like:
     👉 people, authorities, government

3. Common in exams:

   • Modal + passive → needs careful tense + structure match ⚠️

📘 Conclusion:

The correct active voice sentence is:
👉 Authorities are supposed to enforce the law strictly in sensitive areas.