Did deletion of any of the possible control elements cause a reduction in reporter gene expression? how can you tell?

Options are not provided in the question. I found the answer on the Internet.

Yes, deletion of the possible control elements can cause reduction in reporter gene expression. Due to deletion of a control element, the activator cannot bind to the enhancer. This causes reduction in the gene expression.

Deletion of element no. 3 causes a reduction in reporter gene expression.