According to newton's 1st law, the law of inertia, if you hit a baseball with a bat it will a. hurt your hand from the reaction force b. accelerate according to the applied force c. fly in a straight line unless an outside force changes its course d. fall to the ground because of gravitational pull

C. fly in a straight line unless an outside force changes its course.

So the Newtons first law of motion states that an object in a state of uniform motion tends to remain in that states of motion unless an external force is applied and base on your question the possible answer would be letter B. accelerate according to the applied force 

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