Researchers studying the relationship between body length (L, mm) and number of eggs (E, count) in goldfish calculated t

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Researchers studying the relationship between body length (L,
mm) and number of eggs (E, count) in goldfish calculated the
following equation based on one sample:
𝐸¯=10𝑒𝑔𝑔𝑠+0.2𝑒𝑔𝑔𝑠/𝑚𝑚⋅𝐿
They took a second from the same population, and found that the
covariance between E and L, 𝑐𝑜𝑣(𝐿,𝐸) ,in the second
sample was 0.25 times as large as in the first study, but the
variance in length 𝑠2𝐿 was the same as in the first
sample. They also found the average number of eggs per fish was 5
eggs larger in the second sample
What regression slope would the researchers calculate based on
the second sample?
Select one:
a. 2.5 eggs/mm
b. 15 eggs/mm
c. 0.05 eggs/mm
d. 0.1 eggs/mm
e. 4 eggs/mm