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Verbal·Standard English Conventions·Boundaries

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On February 1, 2018, a Florida-based research team-Martha A. Scholl, Maoya Bassiouni, and Angel J. Torres-Sánchez-compiled climate data from several sites in Puerto Rico’s Luquillo Mountains. At site CC1, the site with the highest elevation, the air temperature fluctuated slightly throughout the day, registering __________ and $16^{\circ }\text{C}$ at 5:00 p.m.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

$15.4^{\circ }\text{C}$ at 1:00 a.m. $18.6^{\circ }\text{C}$ at 11:30 a.m.

B

$15.4^{\circ }\text{C}$ at 1:00 a.m. $18.6^{\circ }\text{C}$ at 11:30 a.m.,

C

$15.4^{\circ }\text{C}$, at 1:00 a.m. $18.6^{\circ }\text{C}$, at 11:30 a.m.

D

$15.4^{\circ }\text{C}$ at 1:00 a.m., $18.6^{\circ }\text{C}$ at 11:30 a.m.,