Statement I is correct: The Amaravati Stupa (historically known as the Mahachaitya) was built in the lower Krishna River valley in modern-day Andhra Pradesh, flourishing under the patronage of the Satavahanas and Ikshvakus.
Statement II is not correct: The Amaravati Stupa was actually larger than the Sanchi Stupa. At its zenith, its massive dome diameter reached approximately 50 meters, surpassing the dimensions of Sanchi's Great Stupa (which is around 36 meters in diameter).
Statement III is correct: The dynamic, narrative style of the Amaravati School of Art deeply influenced subsequent South Indian dynastic art forms (like Pallava and Chola sculptures). Due to maritime trade networks, its distinctive white/greenish limestone sculptures and styles were also carried over to Sri Lanka and across Southeast Asia.
Source: https://egyankosh.ac.in/bitstream/123456789/111130/1/Unit-16.pdf
The Notification for the Civil Services Examination, 2021 was released by the Commission on March 04, 2021. The notification contains all the details related to the examination dates, number of vacancies, eligibility criteria, syllabus, application process, fee, exam centers etc. The exam is being conducted to fill in 712 vacancies as listed in the notification with 22 vacancies reserved for Persons with Benchmark Disability. The Preliminary examination will be held on October 10 2021. Candidates can visit the Commission’s website to fill the application form. Detailed instructions for filling up online applications have been provided on the website. The application window was closed on March 24 2021. The admit cards for the Preliminary Examination were made available from September 16 2021. The admit cards can be downloaded from the Commission’s website on the above mentioned link.