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One of the most common sports injuries is a pulled hamstring. It is very difficult to rehabilitate the hamstring. There are different levels, or grades, of injuries to the hamstring muscles. In a grade 1 injury, the hamstring feels tight. A grade 2 injury feels like a cramp that will not stop, and there is swelling. There is significant pain when the muscle is stretched. This often means a minor tear in the muscle. A grade 3 injury is a significant tear in the muscle, and the pain is so severe that the person has trouble walking. Grade 2 and 3 injuries result in bruising.

Which statement best synthesizes ideas from the passage and the image?

The different grades of hamstring injuries reflect how severe the injury can be.
Hamstring injuries are difficult to treat because three muscles can be involved.
It is very difficult to rehabilitate a hamstring injury because the muscles are so strong.
The semimembranosus, biceps femoris, and semitendinosus are the hamstring muscles.