Answer:
A) Isotonic
Step-by-step explanation:
An isotonic concentric contraction results in the muscle shortening, an isotonic eccentric contraction results in the muscle lengthening. During an isometric contraction the muscle is under tension but neither shortens nor lengthens.
In an isotonic contraction, tension remains the same, whilst the muscle's length changes. ... In eccentric, the muscle lengthens due to the resistance being greater than the force the muscle is producing.