Which statement best describes the effect of the grape boycott and 280-mile march on the farmworkers' cause?
a) Both efforts gained national support for the farmworkers and led to better working conditions.
b) The grape boycott and march sparked internal divisions within the farmworkers' movement.
c) The grape boycott and march had little impact on farmworkers' rights and working conditions.
d) The grape boycott and march were met with violent opposition, hindering progress for farmworkers.