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A heterosexual individual seeks relationships with people of the opposite sex. This orientation is defined by a romantic or sexual attraction to individuals of the gender opposite to one's own. Therefore, when considering the nature of the relationships that a heterosexual person is inclined to pursue, it is consistent that they would look for connections, whether platonic or romantic, with individuals of the opposite gender.
The other choices do not align with the definition of heterosexuality. Seeking relationships with people of the same sex would be characteristic of a homosexual orientation. Relationships with multiple partners could suggest polyamory or an open relationship model, which does not necessarily pertain to heterosexuality specifically. Finally, romantic relationships without sexual attraction describe asexuality, which is distinct from heterosexuality. Thus, the essence of heterosexual relationships is fundamentally about engagement with people of the opposite sex.