Identify the correct sequence with regard to externalities:

(A) Leads to negative externalities.

(B) Production by the refining industry pollutes nearby rivers.

(C) Causes harm to people.

(D) Dependent may loose their livelihood.

Choose the correct answer from the options given below:

Option 1 -> Incorrect sequence - places conclusion (A) before final consequence (D).

Option 2 -> Incorrect sequence - starts with the conclusion (A) instead of the cause.

Option 3 -> Correct logical flow: starts with industrial action (B), follows with harm (C), then specific impact (D), and concludes with classification (A).

Option 4 -> Incorrect sequence - starts with general harm (C) before identifying the source (B).

Hence, Option 3: (B), (C), (D), (A) -> This follows the logical cause-and-effect sequence of externalities: First, the refining industry's production pollutes rivers (B - the source), which causes harm to people (C - immediate effect), leading to dependents losing their livelihood (D - specific consequence), ultimately resulting in negative externalities (A - overall conclusion). This sequence demonstrates how a production activity creates a negative externality by imposing costs on third parties who are not involved in the economic transaction. -> correct