BA means Bachelor of Arts, BSc means Bachelor of Science, and MA means Master of Arts (usually undertaken after a BA or BSc).
BSc degrees usually have a greater degree of science or research elements to them. Often universities will offer the same degree, but students can choose whether to have a BA or BSc depending on the courses they take. For example you may be expected to complete more field work or scientific research in order to graduate with a BSc rather than a BA.
Have a look at the courses on offer as part of the degree to see if they are more science-oriented.