PLEASE HELP ME classify this reaction: PLEASE HELP ME classify the following reaction:

your options are
1. synthesis
2. decomposition
3. combustion
4. single replacement
5. double replacement

explain your answer for brainliest

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

it has both hydrogen and oxygen