The correct answer is A) Idukki.
Silent Valley National Park is a national park in the Western Ghats of Kerala, India. It is the largest national park in Kerala and the only tropical rainforest in the Western Ghats that is home to a large population of elephants. The park is also home to a variety of other animals, including tigers, leopards, deer, and monkeys.
The park was established in 1980 to protect the Silent Valley forest, which is one of the last remaining undisturbed tropical rainforests in India. The park is also home to a number of important plant species, including the endangered Nilgiri tahr.
The park is a popular tourist destination, and offers a variety of activities, including trekking, camping, and bird watching.
Option B, Palakkad, is incorrect because the Silent Valley National Park is not located in Palakkad. Palakkad is a district in Kerala, India.
Option C, Kannur, is incorrect because the Silent Valley National Park is not located in Kannur. Kannur is a district in Kerala, India.
Option D, Malappuram, is incorrect because the Silent Valley National Park is not located in Malappuram. Malappuram is a district in Kerala, India.