Does the sentence "Use of traditional cavalry on the battlefields of 1914 proved to be disastrous, due to accurate, long-range rifle fire, machine-guns and artillery." provide a valid answer to the question "What military tactic proved to be unsuccessful on the 1914 battlefields?"

A: yes

Does the sentence "In the 1820s, Boston's population grew rapidly, and the city's ethnic composition changed dramatically with the first wave of European immigrants." provide a valid answer to the question "How did Boston's population change in the 1820's?"

A: yes

Does the sentence "They proposed instead that a comprehensive regime to protect the Antarctic environment be negotiated in its place." provide a valid answer to the question "When did negotiations start to regulate mining in Antarctica?"

A: no

Does the sentence "In Central Catalan, unstressed vowels reduce to three: /a" provide a valid answer to the question "Where do you find dialectic vowel reductions?"

A:
no