Which of the following sentences is punctuated correctly?
a.
the leaning tower of pisa which started construction in 1173 did not begin sinking into the ground (until the third story was built).
b.
the leaning tower of pisa—which started construction in 1173, did not begin sinking into the ground until the third story was built.
c.
the leaning tower of pisa, which started construction in 1173, did not begin sinking into the ground until the third story was built.
d.
the leaning tower of pisa which started construction in 1173 did not begin sinking—into the ground until the third story was built.
Learning Towers Are used In Houses And places All over The World.
The answer is
C. The Leaning Tower of Pisa, which started construction in 1173, did not begin sinking into the ground until the third story was built
The construction of the Leaning Tower of Pisa began on August 14, 1173 and was opened in 1372.
Tana=94/7.4
a=arctan(94/7.4)
a=85.5 (to the nearest hundredth of a degree)
By Pythagorean Theorem...
d=(94^2+7.4^2)^(1/2)
d=94.29 ft
Original construction in 1173. By the time builders got to the 3rd floor it had begun to lean 1178.
C - The Leaning Tower of Pisa, which started construction in 1173, did not begin sinking into the ground until the third story was built.
The use of commas sets off the dependent clause (which started construction in 1173).