Question

Oil and water .................... not mix.

• A. do
• B. could
• C. does
• D. should

Hint:

Compound subjects joined by "and" take plural verbs.

Answer 1

The Correct Option is A

Step 1: Subject.
"Oil and water" is a compound plural subject, so we need a plural verb.

Step 2: Checking options.
(A) do — correct plural verb.
(B) could — expresses possibility, not general truth.
(C) does — singular, incorrect.
(D) should — indicates advice, not a fact.

Step 3: Conclusion.
Correct answer is (A) do.