Select from: a). Kang asked them to; b). not enough information; c). they saw the US do it first; d). they know how expensive the drills can be;
Q: Read the following context and answer the question. Context: SEOUL South Korean Foreign Minister Kang, Kyung-wha said on Wednesday that the U.S. and South Korea jointly made the decision to suspend combined military exercises scheduled for August, but would not confirm if her government was given advanced notice before U.S. President Trump announced his intention to cancel the drills, after he met with North Korean leader Kim Jong Un in Singapore on June 12. "We have made it clear that this is a goodwill gesture to strengthen the dialogue momentum at this point, but they are not irreversible. They could quickly come back should we see the dialogue momentum losing speed or North Korea not living up to its denuclearization commitment," said Foreign Minister Kang. During a press briefing in Seoul, the foreign minister said she was in in close communication with U.S. Secretary of State Mike Pompeo about the drills directly following the Singapore summit. And while the announcement canceling the exercises came suddenly, Kang said, South Korea was also considering this option to keep diplomatic momentum moving forward following the U.S.-North Korea summit where Kim reaffirmed his commitment to the "complete denuclearization" of North Korea. The now cancelled Ulchi Freedom Guardian exercises normally held in August usually bring in 3,000 more American troops from abroad and involve 50,000 South Korean troops. No decision has yet been made whether the other large-scale joint exercise held in the spring would be suspended as well. At the Singapore summit Trump said he would cancel the "war games" that he said were both enormously expensive and "provocative," as an act of good faith and in response to North Korea's commitment to denuclearization, its continued suspension of nuclear and missile teats, and the recent closing of its nuclear testing site. North Korea has long called for the end of these joint military exercises that it says are offensive "rehearsals for war." In the past U.S. officials refused to suspend the joint drills, that they defended as defensive in nature... Question: What is the most probable reason that South korea agreed to stop the drills? Answer:
A:
c).