Photography changed drastically _________ introduced in the market. Options.
A) when polariod  B) when polariod  C) when polariod  D) as polaroid  E) 1312
Explanation:   There is no adequation information is given about details of subsequent changes. So "when" is the right word. Option a. "As" inditates reason.   Answer:as polaroid
<result>D</result>
Photography changed drastically _________ introduced in the market.