An idiom is a phrase that when taken as a whole, has a meaning you wouldn't be able to deduce from the meanings of the individual words. Take a look at the bolded idiom in this quote from Of Mice and Men and determine the meaning: ‘Jes’ a little stretch down the highway,’ he says. ‘Jes’ a little stretch.’

a
Limbering up
b
not far
c
warming up before an event
d
to elongate