♥ $$\times$$ ☺ $$=$$ ♦  Since ☺ is an even number,~♦ must also be an even number.  ♦ $$-\textasciitilde3$$ is the only option to given an odd answer because even $$-$$ odd $$=$$ odd. 
♥ $$\times$$ ☺ $$=$$ ♦  ☺ is an even number.  which of the following gives an odd answer? 

[a] ♦ $$-\textasciitilde3$$ 
[b] ☺ $$+$$ ♦ 
[c] ☺ $$\times$$ ☺ 
[d] ♦ $$\times$$~♦ 