In IELTS Academic Writing Task 1, when describing a significant and sudden change in data, such as a sharp increase on a line graph, which adverb is most appropriate to convey this intensity?

Explanation

The adverb 'dramatically' effectively conveys a sudden and significant change, which is essential for accurately describing a sharp increase or decrease in data on graphs for IELTS Academic Writing Task 1. The other options describe changes of different magnitudes or speeds.