This question is categorization and is easy to figure out with some close reading:
A fifth degree expression has a highest power of 5 so that takes out answers (2) and (3) leaving (1) and (4).
A leading coefficient of 7 is exactly what it sounds like — does answer choice (1) or (4) have a first term that starts with a 7?
A constant of 6 is 6 without any algebra or variables so find that to confirm your answer! 🙂