Which of These Occurs During an Isometric Contraction of a Skeletal

Which of these occurs during an isometric contraction of a skeletal muscle?

A) The I bands shorten and the A bands stay the same length.
B) The thick and thin filaments slide past each other.
C) Sarcomere length does not change.
D) The A bands shorten and the I bands stay the same length.
E) Cross-bridges lock onto actin,similar to what occurs in rigor mortis.