A、in February B、in March C、in April D、in May B

The Bolivian president Carlos Mesa has announced his resignation after mass protests calling for constitutional reform and the nationalization of the energy industry. Mr. Mesa said in a live television address, that he could do no more for Bolivia.
   Our South America correspondent Eliot Gotkin reports from La Paz:
   In presenting his resignation an emotional President said that he bad gone as far as he could go. He blamed his decision on the intransigence of the protesters. For weeks they have blocked roads and paralyzed La Paz. Violence has grown and fuel in Bolivia’s main city has pretty much run out. Mr. Mesa described the protestors as a minority trying to impose their will on the majority. He said they had taken advantage of his promise not to use force to crush the demonstrations. It is still unclear whether Congress will accept the President’s resignation. The last time he presented it in March Parliament refused.