Answer:
B. Isosceles
Explanation:
It is 7th grade, maybe even 5th or 6th.
A scalene has no equal sides.
An isosceles has 2 equal sides
An Equilateral has 3 equal sides
Acute has angles less than 90 degrees
The box in the corner means 90 degrees so it's a right triangle and the ticks mean congruent. Obviously right isn't one of the options so isosceles is correct