Sandra and Robert are both fourth graders. If their math achievement fits typical patterns for boys and girls, which of the following is most likely?

Robert's achievement will be higher now, and the gap will be wider when they are in high school.

Their achievement will be about even now, but Sandra will fall behind when they are in high school.

Sandra's achievement will be slightly higher than Robert's now, but she will fall behind later in school.

Their achievement will be about even now, and it will remain about even through high school.