Every human being is [vulnerable] to communicable disease

Step 1: Analyze the question You are asked to pick the word closest in meaning to "vulnerable" in the sentence: "Every human being is vulnerable to communicable disease."

Step 2: Explain the concept Vulnerable means open to harm, attack, or danger; easily affected or susceptible. In this sentence, it means that humans can easily catch communicable (contagious) diseases.

Step 3: Check each option

• A. liable: In this context, "liable" means likely to be affected by something, or prone to it (e.g. "liable to catch colds"). It fits well.
• B. lifted: This means raised up. It has nothing to do with being exposed to harm.
• C. immune: This is the opposite of vulnerable. It means protected from disease. It is a common trap in antonym/synonym questions.
• D. closed: This has no connection to the meaning.

Step 4: Answer "Liable" (susceptible, prone to) is the closest in meaning to "vulnerable" here. The sentence reads naturally as: "Every human being is liable to communicable disease."

Tip: In "nearest in meaning" questions, watch out for the opposite word among the options (here, "immune"). Substitute each option into the sentence and see which one keeps the original meaning. Related words for vulnerable: susceptible, exposed, prone, liable, open to.