When the campaign was over, word about it kept spreading. As a result, orders poured in. Reporters wrote about Sterling's unique invention. This led to even more orders. Because of all the attention, stores began to contact Sterling.

–"Standing Out in the Crowd"

Which signal words does the passage use to show effects? Check all that apply.

“when”
“as a result”
“wrote about”
“this led to”
“because”