Answer
The alkene structure is shown in the picture below.
Work Step by Step
When ozonolysis takes place the double bond breaks and oxygens are attached. Thus, while finding the starting molecule, join the two parts with double bonded oxygens to each other. When there is only one product after ozonolysis, the starting material is a ring. When there are two products formed, the starting material is a chain.
There are two products in the given question, so it must have come from a chain.