NEED HELP Troy has decided that he wants to be healthier. He has been doing a pretty good job sticking to the exercise routine that he designed. However, he tends to eat a lot of junk food. He assumes that if he is exercising, diet is not really that important. What is the BEST response to Troy’s assumption?

A.
If he eliminates junk food, he will be eating healthy.

B.
As long as he is not overweight, diet does not matter.

C.
If he exercises a lot then it does not matter what he eats.

D.
Exercise and attention to diet need to go together to build health.

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Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?