Should be D.. encourages visitors to “touch” each exhibit, which thereby activates the animated functions of the piece First the diction is : encourage sb. to do something. "to do.. and thereby do.." is widely used. I guess ETS does not want to conreadict modern English grammar widely used in media and formal writings. Some examples are found in my daily reading; 1---"Mrs. Clinton is quick to admit errors and thereby distance herself from the old plan."--Nytimes sunday book review. 2----EditorialPublished: June 10, 2006 Most Palestinians are believed to favor a two-state solution that would acknowledge Israel's pre-1967 borders and thus, explicitly or implicitly, Israel's right to exist. But the Hamas-led government that Palestinians elected this year refuses any such gesture. The Palestinian president, Mahmoud Abbas, is now trying to exploit that inconsistency to force Hamas to endorse the mainstream Palestinian position and thereby make it possible to restart peace talks and renew international aid. He is prepared to call for a referendum next month to rally popular support behind his efforts. Published: June 10, 2006 Most Palestinians are believed to favor a two-state solution that would acknowledge Israel's pre-1967 borders and thus, explicitly or implicitly, Israel's right to exist. But the Hamas-led government that Palestinians elected this year refuses any such gesture. The Palestinian president, Mahmoud Abbas, is now trying to exploit that inconsistency to force Hamas to endorse the mainstream Palestinian position and thereby make it possible to restart peace talks and renew international aid. He is prepared to call for a referendum next month to rally popular support behind his efforts.
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