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Optimum temperature, humidity, ventilation and periodic turning are some important requirements for good yield and timely hatching of chickens. A yield of 80 or more chickens per 100 eggs is considered acceptable. A study was conducted to find the optimal conditions for a quick hatch with good yield.

Experiment 1

Incubators with four openings on the top were used and the relative humidity was maintained at 52%. Five incubators with 50 eggs each were maintained at different temperatures.

Table 1

Temperature Successful hatches Average hatching time
99$^\circ$F 42 24 days
100$^\circ$F 48 21 days
101$^\circ$F 47 20 days
102$^\circ$F 44 19 days
103$^\circ$F 38 17 days

Experiment 2

Incubators with four openings on the top were used and the temperature was maintained at 100° F. Five incubators with 50 eggs each were maintained at different humidity levels.

Table 2

Relative humidity Successful hatches Average hatching time
50% 45 21 days
51% 45 21 days
52% 47 21 days
53% 47 20 days
54% 45 20 days

Experiment 3

Incubators with four openings on the side were used and the relative humidity was maintained at 52%. Five incubators with 50 eggs each were maintained at different temperatures.

Table 3

Temperature Successful hatches Average hatching time
99$^\circ$F 40 22 days
100$^\circ$F 44 21 days
101$^\circ$F 42 20 days
102$^\circ$F 40 19 days
103$^\circ$F 34 16 days

Experiment 4

Five incubators (containing 50 eggs each) with standard settings were placed at different sites under different conditions.

Table 4

Specific condition Successful hatches Average hatching time
Directly under the sun 20 18 days
In a windy place 30 17 days
Eggs were not turned at all 35 24 days

According to the guidelines in a certain country, a yield of 70% or more is considered acceptable.

What will be the average hatching time in set of conditions that will give the quickest hatch with an acceptable yield in this country?

A

$10$ days

B

$17$ days

C

$19$ days

D

$20$ days

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