Option 1: Mahendravarman I, was the Pallava ruler who started the long struggle between the Pallavas and the Chalukyas. He reigned from 600-630 CE and was known for his architectural and literary accomplishments. He constructed several rock-cut temples and was a patron of art and culture.

Option 2: Simhavishnu was the successor of Mahendravarman I and ruled from 630-668 CE. He is known for his military campaigns against the Chalukyas and other neighboring kingdoms.

Option 3: Narasimhavarman I, also known as Mamalla, was the son of Mahendravarman I. He ruled from 630-668 CE and is famous for his naval expedition against the Chalukyas and for building the famous Shore Temple at Mamallapuram.

Option 4: Mahendravarman II, also known as Paramesvaravarman, ruled from 668-672 CE. He was not involved in the struggle between the Pallavas and the Chalukyas.

Alert - The correct answer should be option 1: Mahendravarman I.