The service provided by beggars is music.
<u>Option: B</u>
<u>Explanation:</u>
The beggars basically opt music as one of their profession to attract people towards them and depend on it to get money with as such no minimum or maximum amount. Even some do not sing well still they sing in stations, train, buses, traffic area, populated place where they can achieve some food and money by singing or playing music. At some places proper location is provided to them by the authorities on temporary basis, to avoid further any conflict with their team mates and maintain dignity of place without disturbing others. Music gives happiness to beggars, thus they will to perform without any second thought.
Because of advancements in weaponry and armor.<span />
Arabia merchants conduct trade over bigger areas.
