There are 39 distinct numbers in set M, there are 28 distinct numbers in set N, and there are 12 distinct numbers that are in both sets M and N. Set H is the set containing the elements that are in at least one of sets M and N. How many elements are in set H?  Choose the correct choice from the following answers
A) 39  B) 40  C) 55  D) 58  E) 63
{Total} = {M} + {N} - {Both}   {Total} = 39 + 28 - 12= 
<gadget id="calculator">39 + 28 - 12</gadget>
<output>55</output>
55.   Answer: 55.
<result>C</result>
There are 39 distinct numbers in set M, there are 28 distinct numbers in set N, and there are 12 distinct numbers that are in both sets M and N. Set H is the set containing the elements that are in at least one of sets M and N. How many elements are in set H?