Choose the correct sentence which is built from the words and phrases given:
He/ promise/ send/ me/ postcard/ as soon as/ arrive/ Madrid.
A. He promised send me a postcard as soon as he arrived in Madrid.
B. He promised to send me a postcard as soon as he arrived at Madrid.
C. He promised to send me a postcard as soon as he arrived in Madrid.
D. He promised to sending me a postcard as soon as he arrived in Madrid.