Synthesize culture-extension sources for a Paper 3 claim

Psychology HL Paper 3 source booklet: The HL extension is culture within health and well-being. Source A graph reports safe break intention for individual safety message (45) and group-norm safety message (55) from 141 participants using scenario ratings after two heat-safety messages. Source B reports the qualitative theme "students said older volunteers set the tone for whether breaks felt acceptable" from 20 participants using focus group discussion after training. Source C says training observations show breaks increased when senior volunteers modelled them. The claim is: "group culture shapes safer heat-risk choices." Paper 3 Question 4 asks students to interpret at least three sources and judge how far the stated claim is valid. Select the HL extension focus, source issue, data conclusion, and synthesis limit. Then answer this in your own words: what should the student write next to make this Psychology HL Paper 3 response stronger for the exact sources? AI will analyse your source interpretation, data reasoning, extension knowledge, research-method judgement, synthesis, and expression.