Does the sentence "Even when the antenna system has a vertical orientation, such as an array of horizontal dipole antennas, the polarization is in the horizontal direction corresponding to the current flow." provide a valid answer to the question "The polarization of what antenna is essential specification?"

A: no

Does the sentence "Lancashire is smaller than its historical extent following a major reform of local government." provide a valid answer to the question "Why is Lancashire smaller than its historical extent?"

A: yes

Does the sentence "The Tibetan Empire emerged in the 7th century, but with the fall of the empire the region soon divided into a variety of territories." provide a valid answer to the question "When did the Tibetan empire emerge?"

A: yes

Does the sentence "Writings in Estonian became significant only in the 19th century with the spread of the ideas of the Age of Enlightenment, during the Estophile Enlightenment Period (17501840)." provide a valid answer to the question "Who had admiration for the ancient Estonian culture?"

A:
no