An explosion eruption by a single volcano can affect

People surrounding that area because the volcanic ash makes it hard to breathe.

The correct statement is option 4, that is, the 160-pound person burns about twice as many calories jogging as she does walking.

Explanation:

The statement 1st is not correct as one can observe from the graph that the 200-pound individual burns more calories in an hour by doing jogging and playing basketball than performing aerobics.  

The 2nd statement is also not correct as one can see that the 160-pound individual burns more than 50 calories per mile while doing jogging. The statement 3rd is also not correct as when a 200-pound individual plays volleyball for three hours then about 1000 calories will get burned, as in 1 hour of playing 350 calories are burned.  

The last statement, that is, the fourth one is correct as one can see from the graph that a 160-pound individual burns approximately 600 calories by doing jogging and she burns 300 calories while walking.