Multi-choice problem: Continue writing the next sentence in this paragraph:

There are some people snow tubing on a slope covered with snow. two young children

Pick your answer from:
(1). are being snow tubing down a steep hill.;
(2). come down the slope in red and black tubes.;
(3). are snowboarding down a hill riding their snow tubing tubes.;
(4). are talking on the hood of a car or van.;
(2).