The sentence that is correctly construed with an independent clause and a dependent clause is A) As they examined the evidence afresh, they thought of a completely different explanation.
The other sentences don't have dependent clauses, only phrases.
1838-42 - British forces invade, install King Shah Shujah. He is assassinated in 1842. British and Indian troops are massacred during retreat from Kabul.
1878-80 - Second Anglo-Afghan War. A treaty gives Britain control of Afghan foreign affairs.
1919 - Emir Amanullah Khan declares independence from British influence.
1926-29 - Amanullah tries to introduce social reforms, which however stir civil unrest. He flees.
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1933 - Zahir Shah becomes king and Afghanistan remains a monarchy for next four decades.
1953 - General Mohammed Daud becomes prime minister. Turns to Soviet Union for economic and military assistance. Introduces social reforms, such as abolition of purdah (practice of secluding women from public view).
1963 - Mohammed Daud forced to resign as prime minister.
1964 - Constitutional monarchy introduced - but leads to political polarisation and power struggles.
1973 - Mohammed Daud seizes power in a coup and declares a republic. Tries to play off USSR against Western powers.
1978 - General Daud is overthrown and killed in a pro-Soviet coup. The People's Democratic Party comes to power but is paralysed by violent infighting and faces opposition by US-backed mujahideen groups.
The correct answer is B. The Port Harbor Bridge is a source of debate for the town of Port Harbor.
Explanation
Debate is a term that refers to a communication resource that focuses on the collation of different ideas or opinions on a certain topic. The objective of a debate is to present and argue an opinion on an issue to conclude. According to the above, the News Radio Program transcript presents the implicit message of a debate among the residents of Port Harbor, while some want to preserve the Port Harbor Bridge, others do not want to preserve it and each one presents their arguments as expressed in the next paragraph "Residents in the town of Port Harbor are divided over whether they should preserve the Port Harbor Bridge...Opponents argue that preserving the bridge will be too expensive." So, the correct answer is B. The Port Harbor Bridge is a source of debate for the town of Port Harbor.