From your notes you will see that a structure which is bending is in compression on the inside of the bend and tension on the outside.
This question is asking what happens to the leading edge of the wing with wing mounted engines inboard and outboard of the engines?
Draw a picture looking down onto an aircraft,(plan view) fuselage and wings on a full sheet of A4. From the mid point of each wing draw an arrow pointing forwards. This arrow represents the direction of thrust force from the wing mounted engines. Place a flexible ruler side on with the end on one of the engines and hold the other end against the wing fuselage joint. Push the engine end in the direction of the arrow showing engine thrust. Hold the other end firmly, your ruler should bend away from you. The leading edge inboard of the engine is in compression.
Now place the tip of ruler on the wing tip and hold the ruler at the engine. Drag on the aircraft due to flight will tend to bend the ruler towards you. The leading edge outboard of the engine is in tension.