Choose the clearest and most concise restatement.

"While the incident happened, the forklift operator was retrieving a heavy box from a high location of which he had poor visibility."

"The forklift operator was retrieving a heavy box from a high location with poor visibility up there and that caused the incident."

"The incident happened because the forklift operator was retrieving a heavy box from a high location with poor visibility."

"The forklift operator was retrieving a heavy box from a high location, which he had poor visibility of$,$ when the incident happened."

"The circumstances of the incident were that the forklift operator was getting a heavy box located high up and he couldn't see what was going on up there."