In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every $1.5 \mathrm{~m}$ interval up to $30 \mathrm{~m}$ depth. At $3 \mathrm{~m}$ depth, the observed number of hammer blows for three successive $150 \mathrm{~mm}$ penetrations were 8,6 and 9, respectively. The SPT N-value at $3 \mathrm{~m}$ depth, is

(A) 23

(B) 17

(C) 15

(D) 14

In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every $1.5 \mathrm{~m}$ interval up to $30 \mathrm{~m}$ depth. At $3 \mathrm{~m}$ depth, the observed number of hammer blows for three successive $150 \mathrm{~mm}$ penetrations were 8,6 and 9, respectively. The SPT N-value at $3 \mathrm{~m}$ depth, is

(A) 23

(B) 17

(C) 15

(D) 14

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