Find the missing number in the series: 7, 10, 8, 11, 9, 12, ...

Name: CREST Olympiads
Address: Office No. 234, Spaze iTech Park, Tower-B2, 2nd Floor, Sohna - Gurgaon Rd, Sector 49, Gurgaon, 122018, IN
Telephone: +91-98182-94134

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A 7
B 12
C 10
D 13