Match the exercise with the muscle or muscle group it exercises.

Leg Raises ⇒ Abdominals

The raising of and return of the leg motion contracts and relaxes the abdominal muscles thereby exercising it.

Pushdowns ⇒ Triceps

The triceps are activated during motions that require the arms to push so pushdowns work the triceps.

Bench Press ⇒ Pectorals

This is one of the most effective and popular exercise for the pectoral muscles of the chest. It is also very effective for the triceps.

Machine Back Press ⇒ Shoulders

Using this machine activates the shoulders. As the shoulders are not very large muscles, care must be taken when using this so as not to overtax the shoulders.

i think the answer is d.