Single/multi-select question: Does the sentence "In late 1970, after Staffell left to join the band Humpy Bong, the remaining Smile members, encouraged by Bulsara, changed their name to "Queen" and continued working together." provide a valid answer to the question "Tim Staffell left the band Smile in what year?"
Choices:
[a]. yes;
[b]. no;
[a].