Why is an observation table used?

Correct answer: To organise data

The direct answer is D: an observation table is used to organise data. It provides rows and columns so that measurements, conditions, units, and repeated trials can be recorded in a consistent order. Step by step: write a clear heading for each quantity; include units where needed; enter each observation in the correct row or column; then compare values or calculate a result. Option D is correct because organised data are easier to read, check, compare, and analyse. Option A is wrong because decoration is not the scientific purpose of a table. Option B is wrong because a table should make information more visible, not hide questions or results. Option C is wrong because recording data does not stop an experiment; it supports the investigation while it continues. A useful exam cue is to check that table headings identify what was measured and in what unit.