Guys, why the answer is a ?
I substituted by (choice a) in the formula and it gave me change in price of 11.07% not 9.93% , so the answer cannot be a ?
“would be closest to…” Doesn’t say anywhere it has to be exact. 
B and C are not even in the running since the bond price increased.
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Whoever wrote this question subtracted the convexity effect, rather than adding it.
The error’s theirs.
So , Am i right?
There is something wrong with the question
Yes.
Yes . . . I said that.