Need to set Related To on a Pardot created Task

Question

Pardot creates some Tasks for agents to contact a potential customer but the marketing team is saying they cannot set the Related To field to be the Account for the Contact. So I tried setting the Account via a trigger but not getting it to work.

I tried:

trigger TestTaskTrigger on Task (before insert) {
  for (Task t : trigger.new){ 
    String c = t.Who.Name;
    Id a = [select AccountId from contact where name = :c];
    t.What = a;
 } 
}

This just generates an error of Illegal assignment from List to Id

Looking for suggestions.

Answer 1

Revised Answer:

Heres what I would do if I were you

Trigger

trigger TestTaskTrigger on Task (before insert) {
       if(trigger.isInsert && trigger.isBefore){
            Task_Methods.setWhat(trigger.new);
        }
}

Class

public class Task_Methods{
    public static void setWhat(List<Task> newList){
        List<Task> tList = new List<Task>();
        Map<Id,Contact> contactMap = new Map<Id,Contact>([SELECT Id, AccountId FROM Contact WHERE AccountId != null]);

        for(Task t : newList){
            if(contactMap.get(t.WhoId) != null){
                 t.WhatId = contactMap.get(t.WhoId).AccountId;
            }
        }
    }
}