Answer:
A vassal needed economic resources to equip the cavalry he was bound to contribute to his lord to fight his frequent wars. Such resources, in the absence of a money economy, came only from land and its associated assets, which included peasants as well as wood and water.
Russian version:
Вассалу нужны были экономические ресурсы, чтобы вооружить кавалерию, которую он должен был предоставить своему господину для ведения частых войн. Такие ресурсы, в отсутствие денежной экономики, поступали только из земли и связанных с ней активов, которые включали крестьян, а также древесину и воду.
Sorry if the translation is incorrect I had to use goo.gle translate/Извините, если перевод правильный, мне пришлось использовать гугл переводчик.
The answer is B. If it were to cause anything, then it’d be the others, but it just prevents fuel from igniting at the wrong time.
The land between two rivers
<span>An ideal national security policy might balance the need for good relations with other countries against the need to take punitive or pre-emptive actions when necessary. This may prove difficult to achieve in reality because people of different nations may disagree on which policies are appropriate.</span>