The correct answer is: c) Outright opposition.
The Chogyal Palden Thondup Namgyal was the last hereditary ruler of Sikkim. He was opposed to the merger of Sikkim with India, and tried to prevent it from happening. He was eventually forced to accept the merger, but he never reconciled himself to it.
Option a) is incorrect because the Chogyal did not strongly support the merger. He was opposed to it, and tried to prevent it from happening.
Option b) is incorrect because the Chogyal did not resign himself to the merger. He fought against it until the very end.
Option d) is incorrect because the Chogyal was not neutral towards the merger. He was opposed to it.