Statements: The prices of food grains and other essential commodities in the open market have risen sharply during the past three months. The political party in opposition has given a call for general strike to protest against the government's economic policy.

• Statement I is the cause and statement II is its effect.
• Statement II is the cause and statement I is its effect.
• Both the statements I and II are independent causes.
• Both the statements I and II are effects of independent causes.
• Both the statements I and II are effects of some common cause.