Which phrase best captures the meaning of 'espouse' in a social context?

The term 'espouse' is commonly used in a social context to mean to advocate or support a particular cause, belief, or idea. When someone espouses a viewpoint, they actively embrace it and express commitment to it, often encouraging others to adopt the same perspective. This action of supporting or promoting a belief highlights the proactive nature of the term.

In contrast, the other phrases do not align with the meaning of 'espouse.' Disengaging from a topic implies a lack of involvement, while challenging an idea suggests opposition rather than support. Remaining neutral indicates an absence of commitment or advocacy for any side, directly contradicting the concept of espousing something. Thus, the phrase that best captures the essence of 'espouse' in a social context is indeed to advocate or support.