Final answer:
The Magna Carta improved several basic rights, including the protection of free men from unjust imprisonment and the establishment of safe and secure conduct for merchants.
Step-by-step explanation:
The English barons improved several basic rights through the Magna Carta, which was signed by King John in 1215. One of the most important rights protected by the Magna Carta was that no free man shall be seized or imprisoned, or stripped of his rights or possessions, except by the lawful judgment of his equals. This established the precedent for trial by jury. Additionally, the Magna Carta ensured safe and secure conduct for merchants, both domestically and internationally, without any exactions or harm to their bodies or goods.