Based on the premise "Built in approximately 1140 in a spare, unornamented style that combines Frankish Romanesque with local traditions, the church was turned into an Islamic seminary after 1187, when the Crusaders lost Jerusalem.", can we conclude the hypothesis "The church became a seminary for Islam after 1187." is true (see options)?

Available options:
[a]. yes;
[b]. it is not possible to tell;
[c]. no;
[a].