On the First Day of Examination of the Primary Plates

On the first day of examination of the primary plates of an eye culture from a 10-year-old female, the following results were noted:
BAP: moderate growth of small, alpha-hemolytic colonies showing some depressions in the center of each colony
CHOC: moderate growth of small, colonies showing depressions in the center of each and surrounded by a green zone of discoloration
MAC: no growth
Results of testing of the alpha hemolytic colony:
Gram stain: gram-positive cocci in pairs and short chains
Catalase: no bubbles
Optochin susceptibility: 16 mm
Susceptibility testing on Mueller-Hinton with sheep blood agar against 1 ?g oxacillin: 17 mm
Given the testing results above, this organism is possibly a

A) penicillin-sensitive Streptococcus viridans.
B) penicillin-sensitive Streptococcus pneumoniae.
C) penicillin-resistant Streptococcus viridans.
D) penicillin-resistant Streptococcus pneumoniae.