Lilly has 10 fishes, rosy has 7 fishes. Totally how many fishes they have in all?	Choose the most appropriate option.
A) 3 B) 10 C) 6 D) 17 E) 22
10+7= 
<gadget id="calculator">10+7</gadget>
<output>17</output>
17. Answer is 17.
<result>D</result>
Lilly has 10 fishes, rosy has 7 fishes. Totally how many fishes they have in all?