The last of a series of causes, although not necessarily the proximate cause,of an effect or result... Furthermore,the effect or result produced by the proximate cause would have occurred even if there would be a subsequent action,event or force that contributed to the eventual effect or result
He expresses his care, in promising to take care of Paul's bullies tomorrow.
This means he, in this situation specifically, is close to Paul; however, if this excerpt is reflecting on an event from the past, and things have changed since this situation the answer is D.
D) In, Twere profession of our joys/To tell the laity our love john Donne's " A Validation forbidding Mourning" speaker tell his wife that why should she keep his departure a secret.