Identify the present participial phrase that describes john.
a) jamming too much trash into a garbage bag, john saved several trips to the curb but had to carry much heavier bags.
b) jamming too much trash into a garbage bag, john saved several trips to the curb but had to carry much heavier bags.
c) jamming too much trash into a garbage bag, john saved several trips to the curb but had to carry much heavier bags.
d) jamming too much trash into a garbage bag, john saved several trips to the curb but had to carry much heavier bags.