The correct pronoun is "El" because he is a boy and he is your cousin so you have to use "El"
<h3>Choose the phrase that best completes this sentence: </h3><h3>Viajar en avión es</h3>
Answer : C) lo más cómodo.
Entire sentence : Viajar en avión es lo más cómodo.
Translation :
<span>El palo ensebado is when players try and climb a greased pole to reach a gift at the top </span>