Instruction: The user's purchase history implies her preferences. Rank the items in the options based on the user's preferences. Output the item that the user is most likely to purchase next from the options.

Input:
1st: Nikon EN-EL15 Rechargeable Li-Ion Battery for Select DSLR Cameras (Retail Packaging). Electronics. Camera & Photo. Nikon.
2nd: Audioengine A5 Powered Multimedia Speaker System (Black). Electronics. Home Audio. Audioengine.
3rd: Nikon D600 24.3 MP CMOS FX-Format Digital SLR Camera (OLD MODEL). Electronics. Camera & Photo. Nikon.
4th: Sennheiser Momentum Headphone - Brown. Electronics. Headphones. Sennheiser.
5th: Intel 530  180GB 2.5-Inch Internal Solid State Drive (Drive only)SSDSC2BW180A401. Electronics. Computers & Accessories. Intel.
6th: SanDisk Extreme Plus 32GB UHS-1/U3 SDHC Memory Card Up To 80MB/s- SDSDXS-032G-X46 (Label May Change). Electronics. Computers & Accessories. SanDisk.
7th: STK's Fuji NP-95 Battery - 2000 mAH for Fujifilm Finepix X100S, X100, F30, X-S1, F31fd, Real 3D W1, NP-95, BC-65. Electronics. Camera & Photo. STK/SterlingTek.

Options:
A: TROND Bluetooth V4.1 Wireless Sports Headphones Sweatproof Running Gym Stereo Earbuds Headset Built-in Mic/APT-X for iPhone 5s 6 6s plus Galaxy S6 S5 and Android...
B: EarSkinz EarPod Covers (ES2) - Turquoise - for Apple iPhone X / 8 / 7 / 6S / 6 / 5S / 5SE / 5C...
C: European Plug Adapter by Yubi Power 2 in 1 Universal Travel Adapter with 2 Universal Outlets - 2 Pack - Blue - Type C for...
D: Salsa 32t 94mm 5-bolt Chainring Black. Sports & Outdoors. Outdoor Recreation. ShamBo.
E: SODIAL(R) 7 Colors Changing Crystal LED Christmas Angel Decoration Night Light Lamp Gift. Home & Kitchen. Home Dcor. SODIAL(R).
F: Pedrini Italy Colours Collection Stovetop Moka Espresso Maker with Italian EN601 Aluminium and Saftey Valve, Green, 1 cup. Home & Kitchen. Kitchen & Dining. Pedrini.
G: 2 Meat, Poultry, Turkey Baster with Rubber Bulb - Heat Resistant Nylon Tube. Home & Kitchen. Kitchen & Dining. ALAZCO.
H: BestDealUSA DL-DV1300 LED DSLR Video Light for Camera Camcorder Canon Nikon Samsung LF148. Electronics. Video Projectors. BestDealUSA.
I: UZZO trade;Outdoor Fishing Hat,Camouflage Tactical Head Wear Bucket Boonie Hat Cap For Wargame, Hunting Fishing Camping Hiking Sun Cap With 1Free Keyring. Sports & Outdoors...
J: Focus Foodservice Commercial Bakeware 24 Count 2-3/4-Inch Cupcake Pan, 14 by 20.69-Inch. Home & Kitchen. Kitchen & Dining. Focus Foodservice.
K: iSi 9012 The Trick with the Whip- Creations Cookbook. Home & Kitchen. Kitchen & Dining. iSi North America.
L: Glasslock Mixing Bowl, 2-Quart. Home & Kitchen. Kitchen & Dining. GlassLock.
M: Headset Headphone Hands-Free + Microphone Compatible for Only Avaya 9608 9608g Avaya 9620l Avaya 1608-i Only. Electronics. Accessories & Supplies. WirelessFinest.
N: 12 Pack of 2.5" Valance Clips. Home & Kitchen. Home Dcor. Delta Blinds Supply.
O: Unistar 2 Pack Standard Laminated Label Maker Tape for Brother p touch TZe-211 TZe 211, Black on White 0.23 Inch (6mm) x 8m (26.2ft). Electronics...
P: Trumpeter Battery Operated Round Mirrored Display Turntable for Model Kits. Home & Kitchen. Home Dcor. Trumpeter.
Q: Wilton Autograph Mat- Discontinued By Manufacturer. Home & Kitchen. Home Dcor. Wilton.
R: Fiio X3 Mastering Quality Music Player w/ Wolfson DAC WM8740 24Bit 192K. Electronics. Portable Audio & Video. FiiO.
S: Stainless Steel Whistling Tea Kettle or Tea Maker w/Encapsulated Base 2.8 L - Purple. Home & Kitchen. Kitchen & Dining. Imperial Home.
T: Shock Doctor Core Compression Hockey Shorts with Pelvic Protector, Women's & Girls. Sports & Outdoors. Sports & Fitness. Shock Doctor.
Answer: R