When did The US Second Infantry Division hold a tree planting service?

Choices:
A. after the annual joint exercises
B. during the annual joint exercises
C. before the annual joint exercises
D. not enough information
during the annual joint exercises
SEOUL — The annual U.S.–South Korea joint military exercises currently underway have historically been a very public demonstration of force intended, in part, to counter North Korea’s aggressive nuclear and missile tests. But with looming diplomatic summits aimed at reaching a deal to end the North’s nuclear program, media coverage of the drills has so far been limited.
This week, the U.S. Second Infantry Division held a public tree planting ceremony at Camp Casey in South Korea, near the inter-Korean border.
“It is my belief that this tree, like those that have come before it, shall symbolize the roots that bind us together, and to our past in an enduring way,” said General Jon Howerton, the deputy commander of the U.S. 2nd Infantry Division, at the event.
The journalists attending the tree ceremony were also permitted to watch a shooting competition to determine the best marksmen in the participating U.S. and South Korean divisions.
The Camp Casey event was one of the few joint military training activities that news organizations have, so far, been allowed to cover, and it illustrates how the United States and South Korea are downplaying the offensive component of this year’s combined exercises.
“This is clearly in order to send a signal to North Korea that South Korea and the United States are not willing to escalate the situation any further,” said Go Myong-Hyun, a North Korea analyst with the Asan Institute for Policy Studies in Seoul.
This year’s Foal Eagle and Key Resolve combined military exercises are similar in scale to past drills, with more than 23,000 U.S. troops and 300,000 South Korean forces engaging in joint battlefield maneuvers, and responding to computer-simulated attacks from North Korea.
But the start of the drills was delayed this year at South Korea’s request to set a peaceful tone for the Pyeongchang Winter Olympics in the South and to facilitate the North’s participation in the games.