General Bridge questions:
Which type of bridge would you build in each of the following situations. Why?
1. Narrow river, high bank, little water traffic, automotive bridge.
2. Slightly wider river than above, everything else the same as #1.
3. Same as #2, but river is heavily traveled by barges and pleasure boats.
4. Same as #3, but river banks are lower.

Need the answer, and quick, thanks!​ Make a short explanation that's simple.