Which sentence is a run-on sentence?
a. elephants eat large amounts of food, they can consume 600 pounds of food in a day.
b. most humans eat around 3 to 5 pounds of food every day.
c. a blue whale eats up to 6,000 pounds of food per day, which is only 2 percent of its body weight.
d. hummingbirds burn food quickly; they must eat two to three times their body weight every day.