Look at the following text, taken from Daley et al. (2003). They were making comparisons between mothers of children with and without behavioural problems.

Mann–Whitney U tests were used . . . significant differences indicated that mothers of children with behavioural problems displayed less positive initial statements

(z = −4.24) and relationships (z = −4.25), less warmth (z = −5.08) and fewer positive comments (z = −2.82), all p’s < .01 Of the four comparisons, which was the strongest?

(a) Initial statements

(b) Relationships

(c) Warmth

(d) Positive comments