A Healthy 32-Year-Old Man Lifts Weights Regularly as Part of His

A healthy 32-year-old man lifts weights regularly as part of his workout. In one of his biceps muscle fibers at rest, the length of the I band is $1.0 \mu \mathrm{m}$ and the $\mathrm{A}$ band is $1.5 \mu \mathrm{m}$ . Contraction of that muscle fiber results in a $10 \%$ shortening of the length of the sarcomere. What is the length of the A band after the shortening produced by muscle contraction?

A) $1.50 \mu \mathrm{m}$
B) $1.35 \mu \mathrm{m}$
C) $1.00 \mu \mathrm{m}$
D) $1.90 \mu \mathrm{m}$
E) $0.45 \mu \mathrm{m}$