To 'espouse' a cause means to:

To 'espouse' a cause means to marry, adopt, or embrace it. This term emphasizes a strong commitment or dedication to a particular belief or cause, indicating that one not only supports it but also integrates it into their identity or worldview. It implies an active choice to advocate for and promote the cause, much like one might commit to a partner in marriage.

The other options do not align with the definition of 'espouse.' Rejecting a cause entirely would mean completely distancing oneself from it, which is contradictory to embracing it. Merely discussing a cause suggests a superficial engagement without any commitment, and evaluating its merits implies a critical analysis without necessarily endorsing or adopting it. In contrast, espousing directly conveys passionate support and advocacy.