The italicized word ‘appreciated’ means ‘increased’, which is option B. The context of the sentence is that the value of the shares has increased after the last budget. Option A ‘changed’ means something which is different now from the past and Option C ‘decreased’ means something becoming less in quantity or has reduced. Option D ‘crashed’ is used for something that fails suddenly or becomes unsuccessful, like business. But the value of the shares has not changed or decreased. Nor it has crashed. It has appreciated from the last budget, which means ‘increased’ after the last budget. Thus, option B is the answer.