Final answer:
Gaius Gracchus tried to stabilize grain in Rome by introducing measures that provided free grain to the poor, as part of his broader reform efforts which aimed to support the lower classes and maintain social order.
Step-by-step explanation:
Gaius Gracchus, following in his brother Tiberius's footsteps, sought reforms that extended beyond land redistribution to stabilizing the grain supply in Rome. To support poorer citizens and stabilize grain prices, Gaius introduced measures to provide free grain for the poor. This was a part of a broader series of reforms that aimed to reduce the economic strain on the lower class.
The concept of distributing free grain, known as the annona, became a cornerstone of Roman social policy, carried on into the Imperial period. These distributions were further formalized during the reign of Emperor Augustus with the appointment of a praefectus annonae, a prefect tasked with overseeing the grain supply and distribution process.